Bug#791941: cheese won't run if totem is installed -- library conflict

[Robert Lange]

cheese depends on:

libclutter-gst-2.0-0
gstreamer1.0-clutter

totem (and totem-plugins) depends on:

libclutter-gst-3.0-0
gstreamer1.0-clutter-3.0

Debian allows both of these libraries to be installed at the same time.
However, if libclutter-gst-3.0-0 and gstreamer1.0-clutter-3.0 are
installed, then Cheese will fail with the message in the original bug
report. So there is an undocumented conflict here.

This is a problem because, currently, removing libclutter-gst-3.0-0 and
gstreamer1.0-clutter-3.0 causes the removal of totem and totem-plugins,
which in turn causes the removal of gnome and gnome-core. I do not
understand why totem is a dependency of gnome-core, because Gnome
strictly speaking does not depend on Totem; it works fine if Totem is
removed. It seems that it should be a recommended package instead.
Personally, I never use Totem and have VLC selected as the default video
player, and everything in Gnome works fine.

A long-term solution to the problem is to reconcile all apps to use one
of the two gstreamer clutter libraries and remove the other.

A work-around, for people who want Cheese to work now, is to use equivs
to generate fake totem and totem-plugins packages that contain nothing
and depend on nothing. These fake packages will need a high version
number, like 99.0. Use dpkg to install the fake packages over the real
ones, and then use `apt-get purge libclutter-gst-3.0-0
gstreamer1.0-clutter-3.0`, which at this point should remove cleanly
without taking all of gnome-core with it. Once these libraries have been
removed, you need to do one more thing to make Cheese work:

rm -f ${HOME}/.cache/gstreamer-1.0/registry.x86_64.bin

After removing the bad cache file, Cheese should work.