It looks like there was an error communicating with the mirror of the Ubuntu archive which you use.
2020-10-20 14:20:53,870 DEBUG verifySourcesListEntry: deb http://pl.archive.ubuntu.com/ubuntu/ groovy main restricted 2020-10-20 14:20:53,870 DEBUG url_downloadable: http://pl.archive.ubuntu.com/ubuntu//dists/groovy/Release 2020-10-20 14:20:53,870 DEBUG s='http' n='pl.archive.ubuntu.com' p='/ubuntu//dists/groovy/Release' q='' f='' 2020-10-20 14:20:53,882 DEBUG error from httplib: '<urlopen error [Errno -2] Ta nazwa lub usługa jest nieznana>' This is a situation you'll need to sort out before you'll be able to upgrade. ** 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/1900696 Title: do-realase-upgrade -d (from focal0 stops with bad package info To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1900696/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
