[ Thanks to Falko
Timme for this link. ]
“The Appnr web site contains packages from the official
Ubuntu repositories as well as from Medibuntu, Google, and the
Canonical Partner repository. The third-party packages can be
installed only if their repositories are listed in
/etc/apt/sources.list. Therefore we add the Medibuntu, Google, and
Canonical Partner repositories to /etc/apt/sources.list
now.”