It is not enough to just disable the PPA, you need to use the tool 'ppa- purge' from the package ppa-purge to also downgrade the versions of the package provided by the PPA to the official versions of the Ubuntu package. This PPA is certainly causing the failure to calculate the upgrade although there may be others.
https://launchpad.net/~ubuntu- toolchain-r/+archive/ubuntu/test?field.series_filter=xenial ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1782512 Title: could not calculate upgrade bug from 16.04 to 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1782512/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
