Public bug reported: Trying to update an old 18.04 VM and it fails.
$ lsb_release -rd Description: Ubuntu 18.04.5 LTS Release: 18.04 $ do-release-upgrade Checking for a new Ubuntu release Get:1 Upgrade tool signature [1,554 B] Get:2 Upgrade tool [1,340 kB] Fetched 1,342 kB in 0s (0 B/s) authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' extracting 'focal.tar.gz' [sudo] password for mpfj: Reading cache Checking package manager Reading package lists... Done Building dependency tree Reading state information... Done Hit http://us.archive.ubuntu.com/ubuntu bionic InRelease Hit http://security.ubuntu.com/ubuntu bionic-security InRelease Hit http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease Hit http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease Fetched 0 B in 0s (0 B/s) Reading package lists... Done Building dependency tree Reading state information... Done Checking for installed snaps Calculating snap size requirements Updating repository information Get:1 http://security.ubuntu.com/ubuntu focal-security InRelease [109 kB] Hit http://us.archive.ubuntu.com/ubuntu focal InRelease Get:2 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [623 kB] Hit http://us.archive.ubuntu.com/ubuntu focal-updates InRelease Hit http://us.archive.ubuntu.com/ubuntu focal-backports InRelease Get:3 http://security.ubuntu.com/ubuntu focal-security/main i386 Packages [220 kB] Get:4 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages [555 kB] Get:5 http://security.ubuntu.com/ubuntu focal-security/universe i386 Packages [438 kB] Fetched 1,945 kB in 0s (0 B/s) Checking package manager Reading package lists... Done Building dependency tree Reading state information... Done Calculating the changes Calculating the changes Could not determine the upgrade An unresolvable problem occurred while calculating the upgrade. If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to investigate this yourself the log files in '/var/log/dist-upgrade' will contain details about the upgrade. Specifically, look at 'main.log' and 'apt.log'. Restoring original system state Aborting Reading package lists... Done Building dependency tree Reading state information... Done ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: ubuntu-release-upgrader-core 1:18.04.44 ProcVersionSignature: Ubuntu 4.15.0-142.146-generic 4.15.18 Uname: Linux 4.15.0-142-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.23 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: Unity:Unity7:ubuntu Date: Tue Apr 27 22:25:14 2021 InstallationDate: Installed on 2012-06-08 (3245 days ago) InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to bionic on 2021-04-27 (0 days ago) mtime.conffile..etc.update-manager.release-upgrades: 2021-04-27T20:27:01.492636 ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic dist-upgrade -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1926367 Title: Unable to update from 18.04 to 20.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1926367/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs