You have quite a few PPAs enabled and they can cause release upgrades to fail as they may provide package versions which are greater than those in the Ubuntu archive. One PPA which stands out to me is the ubuntu- toolchain PPA - you can try disabling it and removing its packages using the tool 'ppa-purge' from the package of the same name. After that please try the upgrade again.
** Summary changed: - do-release-upgrade fails to calculate upgrade, crashes because appstreamcli crashes iin a g_str* assertion + do-release-upgrade fails to calculate upgrade due to ubuntu-toolchain PPA ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1783619 Title: do-release-upgrade fails to calculate upgrade due to ubuntu-toolchain PPA To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1783619/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs