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[Bug 1342339] [NEW] error plugin opengl not loaded when starting unity


Public bug reported:

Compiz causes unity to fail because it can't load the opengl plugin. Can
we have a way to workaround this to make it easier for users? It seems
like doing something akin to 'sudo dconf reset -f /org/compiz' to
recover might be a good solution, or figure out why the opengl plugin
doesn't load and fix it.

[ test case ]
1) Install desktop normally; have nvidia hardware.
2) Install proprietary drivers, reboot.
3) Uninstall proprietary drivers, reboot.
4) Repeat 2/3 until you log in and you can only see the background.

When switching to a VT and trying to re-run unity I see the message:

compiz (core) - Error: Plugin 'opengl' not loaded.

[ workaround ]
In the VT do:
sudo dconf reset -f /org/compiz/
then log back in

I can reproduce this in the latest trusty as of Jul 15, 2014.

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

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  error plugin opengl not loaded when starting unity

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