Public bug reported: An unresolvable problem occurred while calculating the upgrade.
This was likely caused by: * Unofficial software packages not provided by Ubuntu Please use the tool 'ppa-purge' from the ppa-purge package to remove software from a Launchpad PPA and try the upgrade again. I cannot find the Launchpad package responsible for the problem. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: ubuntu-release-upgrader-core 1:16.04.26 ProcVersionSignature: Ubuntu 4.15.0-47.50~16.04.1-generic 4.15.18 Uname: Linux 4.15.0-47-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.18 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: Unity Date: Mon Apr 15 11:29:13 2019 InstallationDate: Installed on 2018-02-02 (436 days ago) InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to xenial on 2019-04-15 (0 days ago) VarLogDistupgradeTermlog: mtime.conffile..etc.update-manager.release-upgrades: 2018-12-03T15:28:09.383275 ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1824860 Title: unable to upgrade 16.04LTS to 18.04LTS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1824860/+subscriptions -- ubuntu-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs