The last line in the file:
deb http://www.medibuntu.org/sources.list.d/intrepid.list maint.
This is wrong.
Since your sources.list is really long and confusing, I'd recommend to delete 
the content of that file. In order to do that, type 
sudo gedit
in a Terminal and open the file, delete all the content and save.
Then make a new sources.list as described in:
https://help.ubuntu.com/community/Repositories/Ubuntu
After that you can add the Medibuntu repository as described in:
https://help.ubuntu.com/community/Medibuntu
If you have any questions, feel free to ask. :)

-- 
update manager crashes on source list
https://bugs.launchpad.net/bugs/305564
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