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When I try to update, I get this:

root@deepit-R405-A-CPD6A2:/var/lib/apt# sudo apt-get update
E: Type '123443215' is not known on line 61 in source list /etc/apt/sources.list
E: The list of sources could not be read.

Any idea what I can do?

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Start by posting your /etc/apt/sources.list so we can see how damaged it is but if you open that file with a text editor, ie gedit with sudo privileges you should be able to comment out the broken line with #, save it and re-run sudo apt-get update. – Bruno Pereira Feb 6 '12 at 19:19

You need to edit the file /etc/apt/sources.list and fix (at least) line 61 of it. You can edit it by opening a terminal window and doing:

gksu gedit /etc/apt/sources.list

You can comment out that line by putting a # at the start of the line.

share|improve this answer
Solved it! Some unnecessary additions in the list file. This was really stupid, but i'm new to Linux :P. Thanks guys! – Deepit Feb 10 '12 at 17:53

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