Public bug reported: Running $ grep ERROR /var/log/dist-upgrade/main.log shows
2016-05-05 10:23:56,869 ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.' Running synaptic shows no entries under the 'broken' tab. ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: ubuntu-release-upgrader-core 1:15.10.14.4 ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5 Uname: Linux 4.2.0-35-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: Unity Date: Thu May 5 10:38:17 2016 InstallationDate: Installed on 2016-02-05 (89 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to wily on 2016-05-05 (0 days ago) VarLogDistupgradeTermlog: ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug dist-upgrade wily -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1578560 Title: Offered upgrade fails every time "could not calculate upgrade" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1578560/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs