The question I am asking is about debian and does not repect the goal of the forum. But I think it would be the same issue for linux.


I am a beginner at debian.

I hvae just installed debian 7.5.0 amd netinst.

When I execute apt-get update I get errors like Could not resolve 'http.debian.org'

Thus,I changed the mirrors several times in /etc/apt/sources.list but without any result.

I deduced that it is because of the absence of internet connection.

So,I executed ifconfig and ifconfig-a, the output indicates only the loopback no eth0 interface.

However the ethernet card and WLAN card are pretty detected , I checked it through lspci and both cards appear.

I edit / etc / network / interfaces by adding dhcp but it was in vain.

Please, could anybody help me as soon as possible.

it looks like two different problems: 1 your sources.list is corrupted. please post it to check if it is ok. 2: network unavailable. It is really hard to solve without additional information, like what kind of hardware do you have, which GUI have you installed?

Let's focus on the second problem. I have not installed a GUI. I have installed the standard utilities only. Because at the beginning the system was not able to detect a network hardware. How to solve this?

you need to check the hardware, do you have driver for that NIC?

Actually I have checked the hardware through the command lspci and both ethernet card and wireless card are present:

08: Network Controller : Broadcom Corporation ...
09 Ethernet Controller : Atheros Communications ...

I have just noticed that while starting debian the following message : cannot find eth0
Does this help?