Public bug reported: On running update-manager -c no new upgrades are seen. But with the -d option, the upgrade to 18.04.1 becomes available. On choosing to upgrade, it finishes the first step ("preparing to upgrade"). A pop up appears saying that third party sources are disabled, and can be re enabled later on. However, on the next step ("Setting new software channels") it crashes with the message: "Could not calculate the upgrade, an unresolvable error occurred while calculating the upgrade".
Ubuntu release description: Description: Ubuntu 16.04.5 LTS Release: 16.04 Update-manager version info: update-manager: Installed: 1:16.04.13 Candidate: 1:16.04.13 Version table: *** 1:16.04.13 500 500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages 500 http://archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages 100 /var/lib/dpkg/status 1:16.04.12 500 500 http://archive.ubuntu.com/ubuntu xenial-security/main amd64 Packages 500 http://archive.ubuntu.com/ubuntu xenial-security/main i386 Packages 1:16.04.3 500 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages 500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: ubuntu-release-upgrader-core 1:16.04.25 ProcVersionSignature: Ubuntu 4.15.0-30.32~16.04.1-generic 4.15.18 Uname: Linux 4.15.0-30-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.18 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: Unity Date: Wed Aug 8 18:58:23 2018 InstallationDate: Installed on 2017-06-24 (409 days ago) InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader Symptom: ubuntu-release-upgrader UpgradeStatus: Upgraded to xenial on 2018-08-08 (0 days ago) VarLogDistupgradeTermlog: ** 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/1786039 Title: Upgrade from 16.04.5 to 18.04.1 crashes with message unable to resolve upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1786039/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs