borgward; Hi !
Finally getting back 'round to ya !
ok: offending entry is line 6 in /etc/apt/sources.list file.
Remember to make a current backup prior to editing any file.
Make the change in the file: - activate your text editor -
sudo cp /etc/apt/sources.list /etc/apt/sources.list-08Feb2014
I use gedit for the text editor, substitute your favorite.
gksudo gedit /etc/apt/sources.list
In the editor arrow down to "deb http://packages.medibuntu.org/ precise free non-free"
and either place a comment character '#' (commenting why you commented out the line would be a good thing to do ) at the start of the line or better yet, completely remove the line.
Save the file and exit back to terminal:
And post back if there are any reported errors.
sudo apt-get update
sudo apt-get upgrade
Else you are good to go.
ain't nothing but a thing