You seem to have xorg packages installed from a PPA, not the official
Ubuntu archive, and this is causing a failure to calculate the upgrade.
As we, Ubuntu developers, don't have control over the PPA there is
nothing we can do to resolve this situation. I'd suggest you use ppa-
purge to remove the PPA and try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1773845
Title:
"Cant install ubuntu desktop" message during 28 May 2018 update
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