Saturday, April 28, 2018

Apt-Get Update: failure to fetch; can't connect to any sources


I realize there are dozens of "apt-get update: failure to fetch" questions (I read through all I could find), but my present circumstance is unique to 12.04 and it affects all sources; not just launchpad. Additionally, I've tried several different servers in Europe and the U.S. as well as the "main server" (wherever that is) and they all yield the same result: I can't connect to any software sources.


Additionally, I'm fairly certain the problem stems from the upgrade from 11.10->12.04 I performed this morning, as updates worked immediately before.


Updates from the Update Manager worked fine and I could download some things (mutter) from the Software Center without incident, which makes me think I can connect to some subset of the Ubuntu servers (however, several other Ubuntu servers--like extras--and some canonical servers are listed as 'unable to connect').


Here is the output from sudo apt-get update:


sudo apt-get update
Ign http://ftp.u-picardie.fr precise InRelease
Ign http://archive.canonical.com precise InRelease
Ign http://ftp.u-picardie.fr precise-updates InRelease
Ign http://ftp.u-picardie.fr precise-backports InRelease
Err http://ftp.u-picardie.fr precise-security InRelease
Err http://ftp.u-picardie.fr precise Release.gpg
Unable to connect to ftp.u-picardie.fr:http:
Err http://ftp.u-picardie.fr precise-updates Release.gpg
Unable to connect to ftp.u-picardie.fr:http:
Err http://ftp.u-picardie.fr precise-backports Release.gpg
Unable to connect to ftp.u-picardie.fr:http:
Err http://ftp.u-picardie.fr precise-security Release.gpg
Unable to connect to ftp.u-picardie.fr:http:
Hit http://archive.canonical.com precise Release.gpg
Hit http://archive.canonical.com precise Release
Hit http://archive.canonical.com precise/partner i386 Packages
Ign http://archive.canonical.com precise/partner TranslationIndex
Ign http://dl.google.com stable InRelease
Ign http://dl.google.com stable InRelease
Err http://archive.canonical.com precise/partner Translation-en_US
Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80]
Err http://archive.canonical.com precise/partner Translation-en
Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80]
Ign http://extras.ubuntu.com precise InRelease
Get:1 http://dl.google.com stable Release.gpg [198 B]
Err http://extras.ubuntu.com precise Release.gpg
Could not connect to extras.ubuntu.com:80 (91.189.88.33). - connect (111: Connection refused)
Ign http://ppa.launchpad.net precise InRelease
Err http://ppa.launchpad.net precise InRelease
Err http://ppa.launchpad.net precise InRelease
Err http://ppa.launchpad.net precise InRelease
Err http://ppa.launchpad.net precise InRelease
Err http://ppa.launchpad.net precise InRelease
Err http://ppa.launchpad.net precise InRelease
Err http://ppa.launchpad.net precise InRelease
Err http://ppa.launchpad.net precise InRelease
Get:2 http://dl.google.com stable Release.gpg [198 B]
Err http://ppa.launchpad.net precise Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net precise Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net precise Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net precise Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net precise Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net precise Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net precise Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net precise Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net precise Release.gpg
Unable to connect to ppa.launchpad.net:http:
Get:3 http://dl.google.com stable Release [1,347 B]
Get:4 http://dl.google.com stable Release [1,347 B]
Get:5 http://dl.google.com stable/main i386 Packages [1,268 B]
Ign http://dl.google.com stable/main TranslationIndex
Get:6 http://dl.google.com stable/main i386 Packages [769 B]
Ign http://dl.google.com stable/main TranslationIndex
Ign http://dl.google.com stable/main Translation-en_US
Ign http://dl.google.com stable/main Translation-en
Ign http://dl.google.com stable/main Translation-en_US
Ign http://dl.google.com stable/main Translation-en
Fetched 5,127 B in 7s (673 B/s)
Reading package lists... Done
W: Failed to fetch http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/dists/precise-security/InRelease
W: Failed to fetch http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/precise/InRelease
W: Failed to fetch http://ppa.launchpad.net/elementaryart/elementary-dev/ubuntu/dists/precise/InRelease
W: Failed to fetch http://ppa.launchpad.net/midori/ppa/ubuntu/dists/precise/InRelease
W: Failed to fetch http://ppa.launchpad.net/nemequ/sqlheavy/ubuntu/dists/precise/InRelease
W: Failed to fetch http://ppa.launchpad.net/ricotz/docky/ubuntu/dists/precise/InRelease
W: Failed to fetch http://ppa.launchpad.net/sgringwe/beatbox/ubuntu/dists/precise/InRelease
W: Failed to fetch http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu/dists/precise/InRelease
W: Failed to fetch http://ppa.launchpad.net/yorba/ppa/ubuntu/dists/precise/InRelease
W: Failed to fetch http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/dists/precise/Release.gpg Unable to connect to ftp.u-picardie.fr:http:
W: Failed to fetch http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/dists/precise-updates/Release.gpg Unable to connect to ftp.u-picardie.fr:http:
W: Failed to fetch http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/dists/precise-backports/Release.gpg Unable to connect to ftp.u-picardie.fr:http:
W: Failed to fetch http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/dists/precise-security/Release.gpg Unable to connect to ftp.u-picardie.fr:http:
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/partner/i18n/Translation-en_US Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80]
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/partner/i18n/Translation-en Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80]
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release.gpg Could not connect to extras.ubuntu.com:80 (91.189.88.33). - connect (111: Connection refused)
W: Failed to fetch http://ppa.launchpad.net/caffeine-developers/ppa/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/elementaryart/elementary-dev/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/midori/ppa/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/nemequ/sqlheavy/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/ricotz/docky/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/sgringwe/beatbox/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/yorba/ppa/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Some index files failed to download. They have been ignored, or old ones used instead.
W: Duplicate sources.list entry http://ppa.launchpad.net/nemequ/sqlheavy/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/ppa.launchpad.net_nemequ_sqlheavy_ubuntu_dists_precise_main_binary-i386_Packages)
W: Duplicate sources.list entry http://ppa.launchpad.net/sgringwe/beatbox/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/ppa.launchpad.net_sgringwe_beatbox_ubuntu_dists_precise_main_binary-i386_Packages)

Contents of /etc/apt/sources.list:


# deb cdrom:[Ubuntu 11.10 _Oneiric Ocelot_ - Release i386 (20111012)]/ oneiric main restricted
deb-src http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise main restricted #Added by software-properties
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise main restricted
deb-src http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise multiverse universe #Added by software-properties
## Major bug fix updates produced after the final release of the
## distribution.
deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-updates main restricted
deb-src http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-updates restricted main multiverse universe #Added by software-properties
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise universe
deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise multiverse
deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-backports main restricted universe multiverse #Added by software-properties
deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-security main restricted
deb-src http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-security restricted main multiverse universe #Added by software-properties
deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-security universe
deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-security multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu oneiric partner
# deb-src http://archive.canonical.com/ubuntu oneiric partner
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main

Testing Alternate sources.list file


These are the steps I followed to produce the following output:



  1. Please backup your sources.list: sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup


  2. and then replace the contents of /etc/apt/sources.list with the below lines and run apt-get update:



deb http://archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu precise-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu precise partner
deb http://extras.ubuntu.com/ubuntu precise main

Output:


someone@someone-UBook:~$ sudo apt-get update
Ign http://archive.canonical.com precise InRelease
Hit http://archive.canonical.com precise Release.gpg
Hit http://archive.canonical.com precise Release
Ign http://archive.ubuntu.com precise InRelease
Ign http://extras.ubuntu.com precise InRelease
Ign http://archive.ubuntu.com precise-updates InRelease
Hit http://archive.canonical.com precise/partner i386 Packages
Hit http://extras.ubuntu.com precise Release.gpg
Ign http://archive.ubuntu.com precise-backports InRelease
Ign http://archive.canonical.com precise/partner TranslationIndex
Err http://archive.canonical.com precise/partner Translation-en_US
Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80]
Err http://archive.canonical.com precise/partner Translation-en
Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80]
Hit http://extras.ubuntu.com precise Release
Get:1 http://archive.ubuntu.com precise Release.gpg [198 B]
Ign http://dl.google.com stable InRelease
Err http://dl.google.com stable InRelease
Err http://dl.google.com stable Release.gpg
Unable to connect to dl.google.com:http: [IP: 173.194.34.38 80]
Err http://dl.google.com stable Release.gpg
Unable to connect to dl.google.com:http: [IP: 173.194.34.38 80]
Get:2 http://archive.ubuntu.com precise-updates Release.gpg [198 B]
Hit http://extras.ubuntu.com precise/main i386 Packages
Get:3 http://archive.ubuntu.com precise-backports Release.gpg [198 B]
Ign http://security.ubuntu.com precise-security InRelease
Ign http://extras.ubuntu.com precise/main TranslationIndex
Err http://extras.ubuntu.com precise/main Translation-en_US
Unable to connect to extras.ubuntu.com:http:
Err http://extras.ubuntu.com precise/main Translation-en
Unable to connect to extras.ubuntu.com:http:
Get:4 http://security.ubuntu.com precise-security Release.gpg [198 B]
Get:5 http://archive.ubuntu.com precise Release [49.6 kB]
Get:6 http://security.ubuntu.com precise-security Release [49.6 kB]
Get:7 http://archive.ubuntu.com precise-updates Release [49.6 kB]
Get:8 http://archive.ubuntu.com precise-backports Release [49.6 kB]
Get:9 http://security.ubuntu.com precise-security/main i386 Packages [32.9 kB]
Get:10 http://archive.ubuntu.com precise/main i386 Packages [1,274 kB]
Get:11 http://security.ubuntu.com precise-security/restricted i386 Packages [14 B]
Get:12 http://security.ubuntu.com precise-security/universe i386 Packages [8,594 B]
Get:13 http://security.ubuntu.com precise-security/multiverse i386 Packages [1,393 B]
Get:14 http://security.ubuntu.com precise-security/main TranslationIndex [73 B]
Get:15 http://security.ubuntu.com precise-security/multiverse TranslationIndex [71 B]
Get:16 http://security.ubuntu.com precise-security/restricted TranslationIndex [70 B]
Get:17 http://security.ubuntu.com precise-security/universe TranslationIndex [72 B]
Get:18 http://security.ubuntu.com precise-security/main Translation-en [13.6 kB]
Get:19 http://security.ubuntu.com precise-security/multiverse Translation-en [587 B]
Get:20 http://security.ubuntu.com precise-security/restricted Translation-en [14 B]
Get:21 http://security.ubuntu.com precise-security/universe Translation-en [6,261 B]
Get:22 http://archive.ubuntu.com precise/restricted i386 Packages [8,431 B]
Get:23 http://archive.ubuntu.com precise/universe i386 Packages [4,796 kB]
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Get:24 http://ppa.launchpad.net precise Release.gpg [316 B]
Get:25 http://ppa.launchpad.net precise Release.gpg [316 B]
Get:26 http://ppa.launchpad.net precise Release.gpg [316 B]
Ign http://ppa.launchpad.net precise Release.gpg
Get:27 http://ppa.launchpad.net precise Release.gpg [316 B]
Hit http://ppa.launchpad.net precise Release.gpg
Get:28 http://ppa.launchpad.net precise Release.gpg [316 B]
Get:29 http://ppa.launchpad.net precise Release.gpg [316 B]
Hit http://ppa.launchpad.net precise Release.gpg
Get:30 http://ppa.launchpad.net precise Release.gpg [316 B]
Hit http://ppa.launchpad.net precise Release.gpg
Get:31 http://ppa.launchpad.net precise Release [11.9 kB]
Get:32 http://ppa.launchpad.net precise Release [11.9 kB]
Get:33 http://archive.ubuntu.com precise/multiverse i386 Packages [121 kB]
Get:34 http://ppa.launchpad.net precise Release [11.9 kB]
Ign http://ppa.launchpad.net precise Release
Get:35 http://ppa.launchpad.net precise Release [11.9 kB]
Hit http://archive.ubuntu.com precise/main TranslationIndex
Hit http://archive.ubuntu.com precise/multiverse TranslationIndex
Hit http://ppa.launchpad.net precise Release
Hit http://archive.ubuntu.com precise/restricted TranslationIndex
Get:36 http://ppa.launchpad.net precise Release [11.9 kB]
Hit http://archive.ubuntu.com precise/universe TranslationIndex
Get:37 http://ppa.launchpad.net precise Release [11.9 kB]
Get:38 http://archive.ubuntu.com precise-updates/main i386 Packages [96.5 kB]
Hit http://ppa.launchpad.net precise Release
Get:39 http://ppa.launchpad.net precise Release [11.9 kB]
Get:40 http://archive.ubuntu.com precise-updates/restricted i386 Packages [770 B]
Hit http://ppa.launchpad.net precise Release
Get:41 http://archive.ubuntu.com precise-updates/universe i386 Packages [27.7 kB]
Get:42 http://ppa.launchpad.net precise/main Sources [524 B]
Get:43 http://archive.ubuntu.com precise-updates/multiverse i386 Packages [1,393 B]
Get:44 http://ppa.launchpad.net precise/main i386 Packages [507 B]
Hit http://archive.ubuntu.com precise-updates/main TranslationIndex
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://archive.ubuntu.com precise-updates/multiverse TranslationIndex
Hit http://archive.ubuntu.com precise-updates/restricted TranslationIndex
Get:45 http://ppa.launchpad.net precise/main Sources [932 B]
Hit http://archive.ubuntu.com precise-updates/universe TranslationIndex
Get:46 http://ppa.launchpad.net precise/main i386 Packages [1,017 B]
Get:47 http://archive.ubuntu.com precise-backports/main i386 Packages [559 B]
Ign http://ppa.launchpad.net precise/main TranslationIndex
Get:48 http://archive.ubuntu.com precise-backports/restricted i386 Packages [14 B]
Get:49 http://archive.ubuntu.com precise-backports/universe i386 Packages [1,391 B]
Get:50 http://ppa.launchpad.net precise/main Sources [1,402 B]
Get:51 http://archive.ubuntu.com precise-backports/multiverse i386 Packages [14 B]
Hit http://archive.ubuntu.com precise-backports/main TranslationIndex
Get:52 http://ppa.launchpad.net precise/main i386 Packages [1,605 B]
Hit http://archive.ubuntu.com precise-backports/multiverse TranslationIndex
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://archive.ubuntu.com precise-backports/restricted TranslationIndex
Hit http://archive.ubuntu.com precise-backports/universe TranslationIndex
Hit http://archive.ubuntu.com precise/main Translation-en
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://archive.ubuntu.com precise/multiverse Translation-en
Get:53 http://ppa.launchpad.net precise/main Sources [931 B]
Hit http://archive.ubuntu.com precise/restricted Translation-en
Get:54 http://ppa.launchpad.net precise/main i386 Packages [1,079 B]
Hit http://archive.ubuntu.com precise/universe Translation-en
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://archive.ubuntu.com precise-updates/main Translation-en
Hit http://ppa.launchpad.net precise/main Sources
Hit http://archive.ubuntu.com precise-updates/multiverse Translation-en
Hit http://ppa.launchpad.net precise/main i386 Packages
Hit http://archive.ubuntu.com precise-updates/restricted Translation-en
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://archive.ubuntu.com precise-updates/universe Translation-en
Get:55 http://ppa.launchpad.net precise/main Sources [3,611 B]
Hit http://archive.ubuntu.com precise-backports/main Translation-en
Get:56 http://ppa.launchpad.net precise/main i386 Packages [2,468 B]
Hit http://archive.ubuntu.com precise-backports/multiverse Translation-en
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://archive.ubuntu.com precise-backports/restricted Translation-en
Hit http://archive.ubuntu.com precise-backports/universe Translation-en
Get:57 http://ppa.launchpad.net precise/main Sources [1,524 B]
Get:58 http://ppa.launchpad.net precise/main i386 Packages [2,719 B]
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://ppa.launchpad.net precise/main Sources
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Get:59 http://ppa.launchpad.net precise/main Sources [1,052 B]
Get:60 http://ppa.launchpad.net precise/main i386 Packages [1,388 B]
Ign http://ppa.launchpad.net precise/main TranslationIndex
Get:61 http://ppa.launchpad.net precise/main Sources [1,185 B]
Get:62 http://ppa.launchpad.net precise/main i386 Packages [1,698 B]
Ign http://ppa.launchpad.net precise/main TranslationIndex
Err http://ppa.launchpad.net precise/main Sources
404 Not Found
Err http://ppa.launchpad.net precise/main i386 Packages
404 Not Found
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_US
Ign http://ppa.launchpad.net precise/main Translation-en
Fetched 6,699 kB in 15s (445 kB/s)
Reading package lists... Done
W: Failed to fetch http://dl.google.com/linux/talkplugin/deb/dists/stable/InRelease
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/partner/i18n/Translation-en_US Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80]
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/partner/i18n/Translation-en Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80]
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/sta


I just found the answer here. Evidently apt can't handle very many software sources, so I was able to solve my problem by deselecting all except the one I needed to access. This would be a real pain to do frequently, but it's better than nothing. From the site:



From the "Other Software" tab, disable all PPA repositories, leaving only the official Ubuntu repositories active. Enabling too many PPA repositories (which are non-official) can cause your package manager to become unstable.



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