Thanks for your report.
Could you please revert xorg from xorg-edgers and firefox (and related
packages) to the versions from the official repository. You can install
ppa-purge to help you with this.
I'm closing this report because it is not a bug with Ubuntu. Don't
hesitate to submit any new bug.
** Changed in: update-manager (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/777352
Title:
do-release-upgrade can't calculate the changes
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