*** This bug is a duplicate of bug 1069133 ***
https://bugs.launchpad.net/bugs/1069133
ppa-purge ppa:oibaf/graphics-drivers did the trick.
Thanks for pointing me in the right direction!
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*** This bug is a duplicate of bug 1069133 ***
https://bugs.launchpad.net/bugs/1069133
Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides Xorg packages. This will prevent the upgrade as that
PPA contains different versions of packages essential to Ubuntu
