*** 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
/var/log/dist-upgrade/main.log
** Attachment added: "/var/log/dist-upgrade/main.log"
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1888364/+attachment/5394587/+files/main.log
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