Something wicked happened resolving medibuntu repository, what happens?

Solution 1:

Medibuntu has now been shut down, the packagers were either obsolete, unnecessary or moved to the official Ubuntu archive.

-- https://help.ubuntu.com/community/Medibuntu

What this means? That you should remove the repositories from your sources.list to prevent errors and look for the packages you needed somewhere else or stick with the old ones that you have installed.

Related

• I can't install libdvdcss - script not finding medibuntu, How to get DVD playback?
• The Medibuntu Project has come to an end - what do I do now?

How to remove the repository:

1. Open "Software Sources";
2. Locate the Medibuntu repository;
3. Select and remove it:

Solution 2:

If you want to remove medibuntu as a software source from the command line, edit the sources.list located in /etc/apt/

vi /etc/apt/sources.list

and then just comment out the line(s) that contain medibuntu.

...
deb http://archive.canonical.com/ubuntu/ precise partner
#deb http://packages.medibuntu.org/ precise free non-free