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I have installed Ubuntu laptop Toshiba Satellite L640?, and I had difficulty, that is how to enable network interfaces, eth0 was not detected when running ifconfig.

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What does cat /etc/network/interfaces show? Please edit and add that to your question. –  slhck May 20 '12 at 15:14

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Most likely the driver is not installed, so you have to find out the driver and load the related kernel module ... Exec this command to find out the network card you have installed :

lspci | grep -i eth
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I don't know too, but there are no interfaces were detected after installing Ubuntu 10.04, only lo, it is difficult for me in doing the update repository okay I will try this command, thank you –  deni hadi May 20 '12 at 15:39
    
so what does the output of "lspci | grep -i eth" give you? (we already know that no interfaces were properly detected; nevertheless the lspci command might give you some hints on which interfaces are actually installed - so you (might) know which driver you have to manually install to get your interface be properly enabled) –  umläute May 21 '12 at 18:43

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