Thanks for your report.
Xorg packages you installed from a PPA are blocking the upgrade. Please
revert to version from an official Ubuntu repository and try the upgrade
again.
Don't hesitate to submit any bug you may find.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1791020
Title:
Fail to upgrade to 18.04LTS from 16.04LTS
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