I am installing Ubuntu Server 12.04.2 LTS 64Bit. Everything is fine up until it gets to "Configuring apt" and it is stuck at "Retrieving file 61 of 69".

I left it on for 6 hours now and is still stuck at that same point.

I have tried restarting the installation with network cable disconnected, I have tried skipping this step by clicking the only available button "cancel" but then it fails later in the process. (I can't remember where)

Some people said to try and open another terminal CTRL-ALT-F2 and do "ifconfig eth0 down" but when I tried that it says "ifconfig" is not a command... nothing really works actually, not even "man".