Error Message when starting Update: Failed to load the package list

Posted by George on Ask Ubuntu See other posts from Ask Ubuntu or by George
Published on 2012-09-29T21:41:10Z Indexed on 2012/09/29 21:49 UTC
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Message says:
Failed to load the package list

This is a serious problem. Try again later. If this problem appears again, please report an error to the developers.
Click details, which says: E:Type 'http://ppa.launchpad.net/madman2k/ubuntu' is not known on line 61 in source list /etc/apt/sources.list
Tried this solution: sudo rm /var/lib/apt/lists/* -vf
sudo apt-get update
However, when entering the first command, it hits back an error:
rm: cannot remove `/var/lib/apt/lists': Is a directory

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