*** 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 package version numbers greater than the release
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Confirmed
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