networking - Completely disappeared Wireless

Some days ago after partial upgrade and update my "Ubuntu 12.04 64bit" wireless disappeared.

I googled and tried several solutions such as:

1.BIOS Reset

2.Re-installing all packages related to wireless via Synaptic.

3.Re-installing bcmwl-kernel-source.

4.Running this command via terminal sudo rfkill unblock all.

But none have any effect. Now with rfkill list all I can see that:

soft block=0
hard block=0

In section Wireless LAN,
so it is ok.
In additional drivers section I see disabled Broadcom STA Wireless driver, and try enable it, but it gives error with long log in file /var/log/jockey.log

Important fact: My hardware is OK as I have tried to use WiFi via LiveCD and it worked. So the problem is in my Ubuntu 12.04.

But what else can I do?
Wireless option has just disappeared from network window.
Fn+F3 doesn't do anything, the wireless light is always turned OFF.

When I write ifconfig in terminal, it doesn't show Wlan as it showed before. It gives this code:

$ ifconfig
bnep0     Link encap:Ethernet  HWaddr 90:00:4e:12:2a:24
          inet addr:192.168.44.88  Bcast:192.168.44.255  Mask:255.255.255.0
          inet6 addr: fe80::9200:4eff:fe12:2a24/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:23059 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20570 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:18550526 (18.5 MB)  TX bytes:3535892 (3.5 MB)
eth0      Link encap:Ethernet  HWaddr 88:ae:1d:63:30:2d
          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)
          Interrupt:16
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:12685 errors:0 dropped:0 overruns:0 frame:0
          TX packets:12685 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:982631 (982.6 KB)  TX bytes:982631 (982.6 KB)

iwconfig gives this:

bnep0     no wireless extensions.
eth0      no wireless extensions.
lo        no wireless extensions.

You can find everything about troubleshooting the wireless connections at this wiki page.

If nothing helps, reinstall Ubuntu.