Thanks for your report.
You have xorg packages installed from the oibaf PPA. Please revert to
the official Ubuntu versions and try the upgrade again.
Do not hesitate to report any bug you may find.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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You received
** Tags added: xenial2bionic
** Tags added: third-party-packages
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1790854
Title:
Cannot update to 18.04
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