Reviewing the files from your upgrade attempt you seem to have enabled
the Oibaf PPA (https://launchpad.net/~oibaf/+archive/graphics-drivers) .
This will prevent the upgrade as that PPA contains different versions of
packages essential to Ubuntu. Please revert to the official Xorg
packages and try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New = Invalid
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https://bugs.launchpad.net/bugs/1309335
Title:
ubuntu gnome 13.10 fails to upgrade to 14.04
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