You have some custom PPA's installed. Looks like the xorg-edgers.
You will need to remove these sources and their packages in order to continue
the upgrade. Consider the tool 'ppa-purge' to do this. Since this is not a
bug in update-manager I am closing the report. Please feel free to continue
commenting here though.
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** Changed in: update-manager (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/932772
Title:
do-release-upgrade error with upgrade
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