12.04 - Cannot Install shutter

I get this error when I try installing shutter:

The following packages have unmet dependencies:

$ sudo apt-get install -f shutter 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created

or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 shutter : Depends: libxml-simple-perl but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

I checked out the other Ask Ubuntu thread but the solution mentions mirrors but he has not elaborated further.

apt - Unable to find expected entry 'main/binary-i386/Packages - Chrome

I recently noticed while installing some packages and using the command apt-get update that I ran into the following error:

Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release  
Unable to find expected entry 'main/binary-i386/Packages' in Release file (Wrong sources.list entry or malformed file)

As mentioned in THIS recent question on Ask Ubuntu, Chrome will no longer be supported by 32 bit systems, however I am currently running 64 bit Ubuntu 14.04, with libc6:i386 libncurses5:i386 libstdc++6:i386 installed for 32 bit application support.

Am I seeing this error because dpkg is looking for the i386 packages as a result of the aforementioned install of libc6:i386 libncurses5:i386 libstdc++6:i386?

How do I resolve this error?

EDIT - (I was not able to resolve this question with simply updating Chrome as mentioned in the other thread, and not all the information in the other answer was present at the time I posted this).

1. Open a new Terminal window and run the following command:

   
   
   

   sudo gedit /etc/apt/sources.list.d/google-chrome.list
   
   




2. In the text file that opens edit the file so that the line reads:

   
   
   

   deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main
   

   
   
   

   The only addition you need to make is entering the [amd64] architecture after deb but preceding the http. Do not edit or replace any other text in this file.




3. Hit Save. Close the Gedit window.

   
   
   

   Now return to the Terminal and refresh your package list by running:

   
   
   
   

   sudo apt-get update
   

   
   
   

   The 'failed to fetch' APT error should no longer appear.

   
   
   

   To prevent the above change being lost, [arch=amd64] needs to be added to the configuration that generates the file edited above:




4. Run the following command:

   
   
   

   sudo gedit  /opt/google/chrome/cron/google-chrome
   
   




5. In the text file that opens search for deb and once again edit the file so that deb http becomes:

   
   
   

   deb [arch=amd64] http
   

   
   
   

   Do not edit or replace any other text in this file.




6. Hit Save. Close the Gedit window.

Sources:

How can I install drivers for nvidia gtx 560?

I have Ubuntu 12.04.1 and nVidia gtx 560

The "Additional Drivers" in system setting is empty!

How can I install the driver...?

Should I download them from the GeForce.com ?

Thanks!

Try enabling the X Updates PPA (see Adding this PPA to your system). It contains the latest stable release of the nVidia graphics drivers (304.43 at the time of writing).

In case 'Additional Drivers' (actually that's Jocky) stays empty, install it like this:

sudo apt-get install nvidia-current nvidia-settings

dual boot - Gparted not resizing partitions & I'm unable to access Ubuntu 14.04 install

I'm trying to resize my partitions, to increase the area for my install of Ubuntu 14.04. I'd like to regain use of that partition, which I was unable to get back into after doing a fresh install of Windows XP on another partition. I'm currently using Ubuntu trial via a boot repair USB.

I unswapped the linux-swap so I could move the partitions, but Gparted comes back with error messages each time I try to resize something. (I can't use a screenshot because I lack enough of a reputation here to upload images.)

In Gparted the partitions are:

/dev/sda,   1ntfs,         9.77GB (3.7GB used);
unallocated,             34.93GB;
/dev/sda2,   extended,    29.83GB;
/dev/sda5,   ext4,        27.83GB (11.8GB used);

/dev/sda6,   linux-swap,   2GB.

I assume the ntfs part is my Windows XP reinstall and the ext4 part is my Ubuntu 14.04 install. I've been reading through answers here and on Gparted but am not getting anywhere.

Backstory: I had Windows XP but it stopped working, then I installed Ubuntu 14.04 alongside it (which has been behaving in faulty ways, not loading properly etc). I re-installed Windows XP on a reduced partition of ~10GB. Since the Win reinstall I'm unable to start the Ubuntu OS, so am using Ubuntu via the trial option on a boot repair USB... My files are backed up.

(I'm on a Dell Latitude 640m laptop.)

This is the error message when I tried to expand the extended (empty, 29.83GB) partition into the unallocated partition (this was too long to be allowed in a comment). Note that there are no lock keys anywhere and everything is unmounted etc: GParted 0.12.1 --enable-libparted-dmraid

Libparted 2.3
Move /dev/sda2 to the left and grow it from 29.83 GiB to 64.76 GiB  00:00:00    ( ERROR )

calibrate /dev/sda2  00:00:00    ( SUCCESS )

path: /dev/sda2
start: 93,745,150
end: 156,301,311
size: 62,556,162 (29.83 GiB)

move partition to the left and grow it from 29.83 GiB to 64.76 GiB  00:00:00    ( ERROR )

old start: 93,745,150
old end: 156,301,311
old size: 62,556,162 (29.83 GiB)
requested start: 20,484,096
requested end: 156,299,263
requested size: 135,815,168 (64.76 GiB)
libparted messages    ( INFO )


Unable to satisfy all constraints on the partition.
Can't have overlapping partitions.

========================================

You may upload a screenshot to some service, and rest here a link. Without an error description it is hard to say what you had encountered.

About your second part of a question, if I properly understood you, the Windows just erased an old loader. It's not a big problem, unless you may load from USB stick. As the Windows doesn't recognizes an alien bootloaders, it is so often occured thing, that the Canonical(a company that develops Ubuntu) even wrote a how-to on how to fix it.

UPD: I am agree with @ Curtis's hypothesis, but I think that you may try to solve this other way, than trying to find latest version, or compiling it from a sources: try to install KDE Partition Manager, and see, what it does (sudo apt-get install partitionmanager).

networking - Constantly lost of the internet connection with the wifi after install Ubuntu 16.04

I have a laptop Lenovo Y700 and I installed Ubuntu 16.04 LTS and I'm having issues with the Wifi.

The wireless connection looks good but I cannot connect to Internet sometimes. To fix it, I do...

service network-manager restart

It works for some minutes but later the same problem and I have to restart again and again, and this is really annoying.

I tried the solutions given in this similar question but the problem continues.

This is the information of my PC...

##### release ###########################
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.1 LTS
Release:    16.04
Codename:   xenial
##### kernel ############################
Linux 4.4.0-57-generic #78-Ubuntu SMP Fri Dec 9 23:50:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 15)
    Subsystem: Lenovo RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [17aa:3832]
    Kernel driver in use: r8169
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter [10ec:8821]
    Subsystem: Lenovo RTL8821AE 802.11ac PCIe Wireless Network Adapter [17aa:a814]
    Kernel driver in use: rtl8821ae
##### lsusb #############################
Bus 001 Device 004: ID 0bda:0821 Realtek Semiconductor Corp.
Bus 001 Device 003: ID 04f2:b512 Chicony Electronics Co., Ltd
Bus 001 Device 002: ID 0438:7900 Advanced Micro Devices, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 0480:a006 Toshiba America Inc External Disk 1.5TB
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 002: ID 046d:c534 Logitech, Inc. Unifying Receiver
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: hci0: Bluetooth
    Soft blocked: yes
    Hard blocked: no
##### lsmod #############################
rtl8821ae             225280  0
btcoexist              53248  1 rtl8821ae
rtl_pci                28672  1 rtl8821ae
rtlwifi                77824  2 rtl_pci,rtl8821ae
mac80211              737280  3 rtl_pci,rtlwifi,rtl8821ae
cfg80211              565248  2 mac80211,rtlwifi
wmi                    20480  0
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
enp1s0    Link encap:Ethernet  HWaddr 
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
wlp2s0    Link encap:Ethernet  HWaddr 
          inet addr:192.168.178.45  Bcast:192.168.178.255  Mask:255.255.255.0
          inet6 addr: fe80::d4e4:4af1:7b11:9187/64 Scope:Link
          inet6 addr: 2003:86:6676:2d00:c28c:48ef:cfeb:a014/64 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:11509 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10836 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:6457711 (6.4 MB)  TX bytes:1833640 (1.8 MB)
##### iwconfig ##########################
lo        no wireless extensions.
enp1s0    no wireless extensions.
wlp2s0    IEEE 802.11abgn  ESSID:"FRITZ!Box 7362 SL"
          Mode:Managed  Frequency:2.412 GHz  Access Point: 
          Bit Rate=72.2 Mb/s   Tx-Power=20 dBm
          Retry short limit:7   RTS thr=2347 B   Fragment thr:off
          Power Management:off
          Link Quality=70/70  Signal level=-40 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:2   Missed beacon:0
##### route #############################
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.178.1   0.0.0.0         UG    600    0        0 wlp2s0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlp2s0
192.168.178.0   0.0.0.0         255.255.255.0   U     600    0        0 wlp2s0
##### resolv.conf #######################
nameserver 127.0.1.1
search fritz.box
##### network managers ##################
Installed:
    NetworkManager
Running:
root      3742     1  1 01:01 ?        00:00:04 /usr/sbin/NetworkManager --no-daemon
##### NetworkManager info ###############
GENERAL.DEVICE:                         wlp2s0
GENERAL.TYPE:                           wifi
GENERAL.NM-TYPE:                        NMDeviceWifi
GENERAL.VENDOR:                         Realtek Semiconductor Co., Ltd.
GENERAL.PRODUCT:                        RTL8821AE 802.11ac PCIe Wireless Network Adapter
GENERAL.DRIVER:                         rtl8821ae
GENERAL.DRIVER-VERSION:                 4.4.0-57-generic
GENERAL.FIRMWARE-VERSION:               N/A
GENERAL.HWADDR:                         
GENERAL.MTU:                            0
GENERAL.STATE:                          100 (connected)
GENERAL.REASON:                         0 (No reason given)
GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:02.3/0000:02:00.0/net/wlp2s0
GENERAL.IP-IFACE:                       wlp2s0
GENERAL.IS-SOFTWARE:                    no
GENERAL.NM-MANAGED:                     yes
GENERAL.AUTOCONNECT:                    yes
GENERAL.FIRMWARE-MISSING:               no
GENERAL.NM-PLUGIN-MISSING:              no
GENERAL.PHYS-PORT-ID:                   --
GENERAL.CONNECTION:                     FRITZ!Box 7362 SL
GENERAL.CON-UUID:                       ac016a1a-695a-461b-adf1-cfb7dc169115
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/0
GENERAL.METERED:                        no (guessed)
CAPABILITIES.CARRIER-DETECT:            no
CAPABILITIES.SPEED:                     72 Mb/s
CAPABILITIES.IS-SOFTWARE:               no
WIFI-PROPERTIES.WEP:                    yes
WIFI-PROPERTIES.WPA:                    yes
WIFI-PROPERTIES.WPA2:                   yes
WIFI-PROPERTIES.TKIP:                   yes
WIFI-PROPERTIES.CCMP:                   yes
WIFI-PROPERTIES.AP:                     yes
WIFI-PROPERTIES.ADHOC:                  yes
WIFI-PROPERTIES.2GHZ:                   yes
WIFI-PROPERTIES.5GHZ:                   yes
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/{0}
CONNECTIONS.AVAILABLE-CONNECTIONS[1]:   ac016a1a-695a-461b-adf1-cfb7dc169115 | FRITZ!Box 7362 SL
IP4.ADDRESS[1]:                         192.168.178.45/24
IP4.GATEWAY:                            192.168.178.1
IP4.ROUTE[1]:                           dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]:                             192.168.178.1
IP4.DOMAIN[1]:                          fritz.box
DHCP4.OPTION[1]:                        requested_subnet_mask = 1
DHCP4.OPTION[2]:                        requested_rfc3442_classless_static_routes = 1
DHCP4.OPTION[3]:                        subnet_mask = 255.255.255.0
DHCP4.OPTION[4]:                        domain_name_servers = 192.168.178.1
DHCP4.OPTION[5]:                        ip_address = 192.168.178.45
DHCP4.OPTION[6]:                        requested_static_routes = 1
DHCP4.OPTION[7]:                        dhcp_server_identifier = 192.168.178.1
DHCP4.OPTION[8]:                        requested_time_offset = 1
DHCP4.OPTION[9]:                        broadcast_address = 192.168.178.255
DHCP4.OPTION[10]:                       requested_interface_mtu = 1
DHCP4.OPTION[11]:                       dhcp_rebinding_time = 756000
DHCP4.OPTION[12]:                       requested_domain_name_servers = 1
DHCP4.OPTION[13]:                       dhcp_message_type = 5
DHCP4.OPTION[14]:                       requested_broadcast_address = 1
DHCP4.OPTION[15]:                       routers = 192.168.178.1
DHCP4.OPTION[16]:                       dhcp_renewal_time = 432000
DHCP4.OPTION[17]:                       requested_domain_name = 1
DHCP4.OPTION[18]:                       domain_name = fritz.box
DHCP4.OPTION[19]:                       requested_routers = 1
DHCP4.OPTION[20]:                       expiry = 1484265694
DHCP4.OPTION[21]:                       requested_wpad = 1
DHCP4.OPTION[22]:                       requested_netbios_scope = 1
DHCP4.OPTION[23]:                       requested_ms_classless_static_routes = 1
DHCP4.OPTION[24]:                       requested_netbios_name_servers = 1
DHCP4.OPTION[25]:                       network_number = 192.168.178.0
DHCP4.OPTION[26]:                       requested_domain_search = 1
DHCP4.OPTION[27]:                       next_server = 192.168.178.1
DHCP4.OPTION[28]:                       ntp_servers = 192.168.178.1
DHCP4.OPTION[29]:                       requested_host_name = 1
DHCP4.OPTION[30]:                       dhcp_lease_time = 864000
DHCP4.OPTION[31]:                       requested_ntp_servers = 1
IP6.ADDRESS[1]:                         2003:86:6676:2d00:c28c:48ef:cfeb:a014/64
IP6.ADDRESS[2]:                         fe80::d4e4:4af1:7b11:9187/64
IP6.GATEWAY:                            fe80::3a10:d5ff:fe44:ca0b
IP6.ROUTE[1]:                           dst = 2003:86:6676:2d00::/64, nh = fe80::3a10:d5ff:fe44:ca0b, mt = 600
IP6.DNS[1]:                             fd00::3a10:d5ff:fe44:ca0b
DHCP6.OPTION[1]:                        requested_dhcp6_domain_search = 1
DHCP6.OPTION[2]:                        dhcp6_name_servers = fd00::3a10:d5ff:fe44:ca0b
DHCP6.OPTION[3]:                        dhcp6_server_id = 0:3:0:1:38:10:d5:44:ca:b
DHCP6.OPTION[4]:                        requested_dhcp6_client_id = 1
DHCP6.OPTION[5]:                        requested_dhcp6_name_servers = 1
DHCP6.OPTION[6]:                        dhcp6_client_id = 0:4:1e:50:81:97:69:9e:72:c:35:a0:90:82:3a:bb:f6:fd
GENERAL.DEVICE:                         enp1s0
GENERAL.TYPE:                           ethernet
GENERAL.NM-TYPE:                        NMDeviceEthernet
GENERAL.VENDOR:                         Realtek Semiconductor Co., Ltd.
GENERAL.PRODUCT:                        RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
GENERAL.DRIVER:                         r8169
GENERAL.DRIVER-VERSION:                 2.3LK-NAPI
GENERAL.FIRMWARE-VERSION:               rtl8168h-2_0.0.2 02/26/15
GENERAL.HWADDR:                         
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.REASON:                         2 (Device is now managed)
GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:02.2/0000:01:00.0/net/enp1s0
GENERAL.IP-IFACE:
GENERAL.IS-SOFTWARE:                    no
GENERAL.NM-MANAGED:                     yes
GENERAL.AUTOCONNECT:                    yes
GENERAL.FIRMWARE-MISSING:               no
GENERAL.NM-PLUGIN-MISSING:              no
GENERAL.PHYS-PORT-ID:                   --
GENERAL.CONNECTION:                     --
GENERAL.CON-UUID:                       --
GENERAL.CON-PATH:                       --
GENERAL.METERED:                        unknown
CAPABILITIES.CARRIER-DETECT:            yes
CAPABILITIES.SPEED:                     unknown
CAPABILITIES.IS-SOFTWARE:               no
WIRED-PROPERTIES.CARRIER:               off
CONNECTIONS.AVAILABLE-CONNECTION-PATHS:
SSID                         BSSID              MODE   CHAN  FREQ      RATE       SIGNAL  BARS  SECURITY   ACTIVE  *
DIRECT-A6-HP OfficeJet 3830    Infra  1     2412 MHz  54 Mbit/s  89      ▂▄▆█  WPA2       no
HITRON-CAE0                    Infra  6     2437 MHz  54 Mbit/s  87      ▂▄▆█  WPA1 WPA2  no
Vodafone Homespot              Infra  6     2437 MHz  54 Mbit/s  87      ▂▄▆█  --         no
Vodafone Hotspot               Infra  6     2437 MHz  54 Mbit/s  87      ▂▄▆█  --         no
FRITZ!Box 7362 SL              Infra  1     2412 MHz  54 Mbit/s  82      ▂▄▆█  WPA2       yes     *
WLAN-34FF25                    Infra  1     2412 MHz  54 Mbit/s  80      ▂▄▆_  WPA2       no
Vodafone Hotspot               Infra  1     2412 MHz  54 Mbit/s  57      ▂▄▆_  --         no
KDG-879CF                      Infra  1     2412 MHz  54 Mbit/s  54      ▂▄__  WPA1 WPA2  no
KD-WLAN-9154 AO                Infra  1     2412 MHz  54 Mbit/s  47      ▂▄__  WPA1 WPA2  no
FRITZ!Box Fon WLAN 7360        Infra  1     2412 MHz  54 Mbit/s  47      ▂▄__  WPA1 WPA2  no
FRITZ!Box 7330                 Infra  1     2412 MHz  54 Mbit/s  47      ▂▄__  WPA1 WPA2  no
Vodafone Hotspot               Infra  1     2412 MHz  54 Mbit/s  44      ▂▄__  --         no
KabelBox-FEE0                  Infra  1     2412 MHz  54 Mbit/s  44      ▂▄__  WPA2       no
KDG-C6833                      Infra  1     2412 MHz  54 Mbit/s  40      ▂▄__  WPA1 WPA2  no
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
##### NetworkManager.conf ###############
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
##### NetworkManager profiles ###########
[[/etc/NetworkManager/system-connections/FRITZ!Box 7362 SL]] (600 root)
[connection] id=FRITZ!Box 7362 SL | type=wifi | permissions=
[wifi] mac-address= | mac-address-blacklist= | ssid=FRITZ!Box 7362 SL
[ipv4] method=auto
[ipv6] method=auto
##### iw reg get ########################
Region: Europe/Berlin (based on set time zone)
country DE: DFS-ETSI
    (2400 - 2483 @ 40), (N/A, 20), (N/A)
    (5150 - 5250 @ 80), (N/A, 20), (N/A), NO-OUTDOOR
    (5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS
    (5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
    (57000 - 66000 @ 2160), (N/A, 40), (N/A)
##### iwlist channels ###################
lo        no frequency information.
enp1s0    no frequency information.
wlp2s0    32 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz
          Channel 36 : 5.18 GHz
          Channel 40 : 5.2 GHz
          Channel 44 : 5.22 GHz
          Channel 48 : 5.24 GHz
          Channel 52 : 5.26 GHz
          Channel 56 : 5.28 GHz
          Channel 60 : 5.3 GHz
          Channel 64 : 5.32 GHz
          Channel 100 : 5.5 GHz
          Channel 104 : 5.52 GHz
          Channel 108 : 5.54 GHz
          Channel 112 : 5.56 GHz
          Channel 116 : 5.58 GHz
          Channel 120 : 5.6 GHz
          Channel 124 : 5.62 GHz
          Channel 128 : 5.64 GHz
          Channel 132 : 5.66 GHz
          Channel 136 : 5.68 GHz
          Channel 140 : 5.7 GHz
          Current Frequency:2.412 GHz (Channel 1)
##### iwlist scan #######################
lo        Interface doesn't support scanning.
enp1s0    Interface doesn't support scanning.
wlp2s0    Interface doesn't support scanning : Device or resource busy
##### module infos ######################
[rtl8821ae]
filename:       /lib/modules/4.4.0-57-generic/kernel/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/rtl8821ae.ko
firmware:       rtlwifi/rtl8821aefw.bin
description:    Realtek 8821ae 802.11ac PCI wireless
license:        GPL
author:         Realtek WlanFAE 
srcversion:     B9E24DCC76240A48AEEF94E
depends:        rtlwifi,rtl_pci,btcoexist,mac80211
intree:         Y
vermagic:       4.4.0-57-generic SMP mod_unload modversions
parm:           swenc:Set to 1 for software crypto (default 0)
 (bool)
parm:           ips:Set to 0 to not use link power save (default 1)
 (bool)
parm:           swlps:Set to 1 to use SW control power save (default 0)
 (bool)
parm:           fwlps:Set to 1 to use FW control power save (default 1)
 (bool)
parm:           msi:Set to 1 to use MSI interrupts mode (default 1)
 (bool)
parm:           debug:Set debug level (0-5) (default 0) (int)
parm:           disable_watchdog:Set to 1 to disable the watchdog (default 0)
 (bool)
parm:           int_clear:Set to 0 to disable interrupt clear before set (default 1)
 (bool)
[rtl_pci]
filename:       /lib/modules/4.4.0-57-generic/kernel/drivers/net/wireless/realtek/rtlwifi/rtl_pci.ko
description:    PCI basic driver for rtlwifi
license:        GPL
author:         Larry Finger    
author:         Realtek WlanFAE 
author:         lizhaoming  
srcversion:     A96EBF28EBD4603749D5EC3
depends:        mac80211,rtlwifi
intree:         Y
vermagic:       4.4.0-57-generic SMP mod_unload modversions
[rtlwifi]
filename:       /lib/modules/4.4.0-57-generic/kernel/drivers/net/wireless/realtek/rtlwifi/rtlwifi.ko
description:    Realtek 802.11n PCI wireless core
license:        GPL
author:         Larry Finger    
author:         Realtek WlanFAE 
author:         lizhaoming  
srcversion:     81DBE78DD4871E3EC5F2E9D
depends:        mac80211,cfg80211
intree:         Y
vermagic:       4.4.0-57-generic SMP mod_unload modversions
[mac80211]
filename:       /lib/modules/4.4.0-57-generic/kernel/net/mac80211/mac80211.ko
license:        GPL
description:    IEEE 802.11 subsystem
srcversion:     0B114888238BEBBE8043BC5
depends:        cfg80211
intree:         Y
vermagic:       4.4.0-57-generic SMP mod_unload modversions
parm:           minstrel_vht_only:Use only VHT rates when VHT is supported by sta. (bool)
parm:           max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int)
parm:           max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int)
parm:           beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int)
parm:           probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int)
parm:           ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)
[cfg80211]
filename:       /lib/modules/4.4.0-57-generic/kernel/net/wireless/cfg80211.ko
description:    wireless configuration support
license:        GPL
author:         Johannes Berg
srcversion:     FD4B9DA2F385F0531B5CB0B
depends:
intree:         Y
vermagic:       4.4.0-57-generic SMP mod_unload modversions
parm:           ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm:           cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)
##### module parameters #################
[rtl8821ae]
debug: 0
disable_watchdog: N
fwlps: N
int_clear: Y
ips: Y
msi: Y
swenc: N
swlps: N
[mac80211]
beacon_loss_count: 7
ieee80211_default_rc_algo: minstrel_ht
max_nullfunc_tries: 2
max_probe_tries: 5
minstrel_vht_only: Y
probe_wait_ms: 500
[cfg80211]
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00
##### /etc/modules ######################
##### modprobe options ##################
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac
blacklist ideapad-laptop
[/etc/modprobe.d/blacklist-ideapad.conf]
blacklist ideapad_laptop
[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off
[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
[/etc/modprobe.d/libopenni-sensor-pointclouds0.conf]
blacklist gspca_kinect
[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en
[/etc/modprobe.d/rtl8821ae.conf]
options rtl8821ae fwlps=N
##### rc.local ##########################
exit 0
##### pm-utils ##########################
[/etc/pm/config.d/config] (644 root)
SUSPEND_MODULES="rtl8821ae"
##### udev rules ########################
##### dmesg #############################
[  580.057551] wlp2s0: RX AssocResp from  (capab=0x431 status=0 aid=5)
[  580.148045] wlp2s0: associated
[ 2172.369033] wlp2s0: Connection to AP  lost
[ 2175.368524] wlp2s0: authenticate with 
[ 2175.368931] wlp2s0: send auth to  (try 1/3)
[ 2175.471452] wlp2s0: send auth to  (try 2/3)
[ 2175.575371] wlp2s0: send auth to  (try 3/3)
[ 2175.679419] wlp2s0: authentication with  timed out
[ 2188.195594] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready (repeated 4 times)
[ 2876.994331] IPv6: ADDRCONF(NETDEV_UP): enp1s0: link is not ready
[ 2877.010288] r8169 0000:01:00.0 enp1s0: link down
[ 2877.010405] IPv6: ADDRCONF(NETDEV_UP): enp1s0: link is not ready
[ 2877.105114] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ 2880.173762] wlp2s0: authenticate with 
[ 2880.177260] wlp2s0: send auth to  (try 1/3)
[ 2880.191121] wlp2s0: authenticated
[ 2880.195454] wlp2s0: associate with  (try 1/3)
[ 2880.204365] wlp2s0: RX AssocResp from  (capab=0x431 status=0 aid=7)
[ 2880.264011] wlp2s0: associated
[ 2880.264042] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
[ 3241.188389] wlp2s0: deauthenticating from  by local choice (Reason: 3=DEAUTH_LEAVING)
[ 3261.305400] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ 3261.311629] IPv6: ADDRCONF(NETDEV_UP): enp1s0: link is not ready
[ 3261.327516] r8169 0000:01:00.0 enp1s0: link down
[ 3261.327692] IPv6: ADDRCONF(NETDEV_UP): enp1s0: link is not ready
[ 3261.448825] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ 3274.151447] wlp2s0: authenticate with 
[ 3278.916185] wlp2s0: send auth to  (try 1/3)
[ 3278.926662] wlp2s0: authenticated
[ 3278.928265] wlp2s0: associate with  (try 1/3)
[ 3278.941799] wlp2s0: RX AssocResp from  (capab=0x431 status=0 aid=5)
[ 3279.050669] wlp2s0: associated
[ 3279.050732] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
########## wireless info END ############

Thank you very much.

I suggest that you disable power saving in Network Manager. From the terminal:

sudo sed -i 's/wifi.powersave = 3/wifi.powersave = 2/' /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf

Next, check the settings in the router. WPA2-AES is preferred; not any WPA and WPA2 mixed mode and certainly not TKIP. Second, if your router is capable of N speeds, you may have better connectivity with a channel width of 20 MHz in the 2.4 GHz band instead of automatic 20/40 MHz, although it is likely to affect N speeds. I also have better luck with a fixed channel, either 1, 6 or 11, rather than automatic channel selection. Also, be certain the router is not set to use N speeds only; auto B, G and N is preferred.

In fact, in the data you submitted, we see ten networks, including the one you are connected to, that are on channel 1. In your case, I suggest, channel 6 or 12 and not 1.

Reboot the router and let us hear your report.

If this is ineffective or only partially effective, then install a better driver

sudo add-apt-repository ppa:hanipouspilot/rtlwifi
sudo apt-get update
sudo apt-get install rtlwifi-new-dkms

Reboot and tell us if connectivity is improved.

apt - How is the sources.list file generated on installation?

I've recently tried to create a custom Ubuntu installer iso from the Ubuntu 16.04 64 bit server installer, with the aim of editing the /etc/apt/sources.list file. I unpacked the iso, expanded the squashfs filesystem, chrooted into it and edited the /etc/apt/sources.list file. Then I repacked the filesystem, regenerated the md5sum and generated a new iso image. This all seemed to work and the iso image can boot and be used to install Ubuntu.

While doing this I noticed that the sources.list file I was editing was much smaller than a normal sources file. It only contained the 'main' component for the archive.ubuntu.com mirror, and similar entries for the security and updates mirrors. When I installed from the new iso, the /etc/apt/sources.list file was the full file I'm used to seeing, complete with all repository components such as universe etc. The sources file also appears to be based on my location, as all entries used the gb.archive.ubuntu url.

I assume that I'd only edited the file used within the installation process, which didn't affect the actual sources file in the final installation.

How is the final version of the /etc/apt/sources.list file generated when the operating system is installed, and can I affect this without recompiling apt?

For generating sources.list:

If what you want to do is select a country mirror, look in to preseeding. The Ubiquity installer supports limited preseeding, but options include:

• setting the country (key: countrychooser/shortlist)


• running a post-install script and manually replacing sources.list (key: ubiquity/success_command)

manpage - How do I look up man page references with round brackets?

I have seen How do I look up man page references with square brackets?. The questioner gives the example of gittutorial(7) and being able to access it by man 7 gittutorial.

When I look at man regex, the top line has:

REGEX(7)                   Linux Programmer's Manual                  REGEX(7)

Now this man page is too difficult for me, so when I see:

AUTHOR
       This page was taken from Henry Spencer's regex package.

SEE ALSO
       grep(1), regex(3)

       POSIX.2, section 2.8 (Regular Expression Notation).

I try man 3 regex but that gives me:

[06:46 PM] ~ $ man 3 regex
No manual entry for regex in section 3
[06:46 PM] ~ $ 

What is the correct way to access regex(3)?

man 7 regex works for regex(7), man 4 tty works for tty(4) and man 8 updatedb works for updatedb(8).

The manpage of regex in section 3 in not present on your system.

To find out which package this file contains type use apt-file. You need to install it first and then update the local cache:

user@host:~# apt-get install apt-file
user@host:~# apt-file update

Then search the cache with:

user@host:~# apt-file search /usr/share/man/man3/regex.3.gz
manpages-dev: /usr/share/man/man3/regex.3.gz

So you see which packages you can install: manpages-dev:

user@host:~# apt-get install manpages-dev

After installation man 3 regex should work.