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I installed ubuntu 12.04, dualbooted with windows 8. I access Internet via proxy server using ethernet hub. It works well with Windows 8 but in Ubuntu, is says wire disconnected. How?

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Do you disconnect your wire when you boot with Ubuntu? :D Seriously, you should give more details if you want any help, like details of your configuration... – m4573r Sep 13 '12 at 17:26
Nope. Configuration like? – rockydgeekgod Sep 13 '12 at 17:29
Like what's your network card? What's the result of ifconfig? What have you already tried? – m4573r Sep 13 '12 at 17:38
ifcofig: eth0 Link encap:Ethernet HWaddr 14:fe:b5:bc:50:87 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:47 – rockydgeekgod Sep 15 '12 at 6:51
lo Link encap:Local Loopback inet addr: Mask: inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:1549 errors:0 dropped:0 overruns:0 frame:0 TX packets:1549 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:281336 (281.3 KB) TX bytes:281336 (281.3 KB) – rockydgeekgod Sep 15 '12 at 6:52

Wire disconnected sounds like the driver for your network card has loaded but the firmware is missing.

Many cards rely on extra software to be loaded to actually "do the work" for them, this makes producing the cards easier and cheaper and also makes upgrades easier as it's just a software upgrade rather than flashing your cards bios. This type of card requires that you obtain the additional software (known as "firmware") and putting it in the correct place (on Linux this is normally /lib/firmware).

Look in /var/log/dmesg to see if there are any messages relating to your network card as it may tell you what file is missing.

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[ 15.747871] r8169 0000:06:00.0: eth0: link down [ 15.747878] r8169 0000:06:00.0: eth0: link down [ 15.748169] ADDRCONF(NETDEV_UP): eth0: link is not ready [ 15.748456] ADDRCONF(NETDEV_UP): eth0: link is not ready – rockydgeekgod Sep 14 '12 at 19:54
Is that the problem? – rockydgeekgod Sep 14 '12 at 19:55
Do you have the package "linux-firmware" installed? It includes the firmware for your card and may fix your problem. – Haqa Sep 14 '12 at 23:44
Yes, it's installed. – rockydgeekgod Sep 15 '12 at 6:50

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