Originally Posted by rainmanne
The problem is that the package manager complains about a broken package and refuses to do anything until Kobo Desktop is removed.
You can fix that by doing following:
open terminal, and run
sudo gedit /var/lib/dpkg/status
Search Kobo entry, somewhere down check line depends:
Depends: libc6 (>= 2.4), libgcc1 (>= 1:4.1.1), libsdl-mixer1.2.....
Remove everything after : so that line contains only Depends:
(note that the line above is just an example, not real kobo depends: entry)