[locomot1f]

i went through this at one point... unfortunately i don't remember the exact steps i took to fix it.
although i know i didn't have to reinstall the OS!

try removing the packages listed and then reinstalling them.

if that doesn't work,
try starting fresh...

install ppa-purge, and purge the following:

Code:

$ sudo apt-get install ppa-purge
$ sudo ppa-purge ppa:wsnipex/mesa

then reinstall the ppa's.
you might want to reboot between the purging and reinstalling.

something is stuck, and not getting cleared to allow the correct drivers to be loaded.