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I have installed Kubuntu 11.04 in my laptop. This morning when I powered it on and tried to connect to the Internet, I can't because of "no network interface" error. How I can resolve this problem?

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Which NIC does your laptop has? and ifconfig output please – Mitch Jul 18 '12 at 16:34

You must first reconfigure network interfaces:

sudo ifconfig eth0 up

sudo ifconfig 

You must see:

eth0Link encap:Ethernet HWaddr 00:11:5b:91:25:3e
inet Mask:
inet6 addr: fe80::211:5bff:fe91:253e/64 Диапазон:Ссылка
RX packets:648009 errors:0 dropped:0 overruns:0 frame:0
TX packets:1075413 errors:0 dropped:0 overruns:0 carrier:0

Then install pppoeconf utility (sudo apt-get install pppoeconf) to connect to the internet. After installing pppoeconf, run sudo ppoeconf and use this utility to check your network drivers. You must choose the interface (eth0 or eth1) to connect to your dsl-modem, login and then enter password.

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