I'd completely forgotten about that, sorry! If I had remembered, I would
have fixed it and not reported this bug.
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https://bugs.launchpad.net/bugs/1245063
Title:
Can't upgrade from 13.0
Reviewing the files from your upgrade attempt you seem to have enabled
the xorg-edgers-ppa. This will prevent the upgrade as that PPA contains
different versions of packages essential to Ubuntu. The page,
https://launchpad.net/~xorg-edgers/+archive/ppa, contains details on to
how to revert to the
