The screenshot shows that the error occurred in the step 'Configuring new software channels' of the 'Complete distribution upgrade'. The error message only says that the upgrade couldn't be calculated, that an 'unsolvable error' happened while calculating the upgrade. The rest of the message are only instructions to seek help about it.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1897956 Title: While upgrading to Ubuntu 20.04.1, it said that the upgrade couldn't be calculated, and stopped. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1897956/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
