*** This bug is a duplicate of bug 1069133 ***
https://bugs.launchpad.net/bugs/1069133
Hi,
I resolved my issue by using ppa purge on ppa:oibaf/graphics-drivers.
Reinstalling default Xorg solved the upgrade issue.
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https://bugs.launchpad.net/bugs/1566615
Title:
unable to upgrade to 16.04 - could not calculate changes
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