Public bug reported: I disabled all "Other packages" in the package manager and still got the error and am unable to upgrade.
ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: update-manager 1:0.156.14.19 ProcVersionSignature: Ubuntu 3.2.0-39.62-generic 3.2.39 Uname: Linux 3.2.0-39-generic i686 ApportVersion: 2.0.1-0ubuntu17.13 Architecture: i386 Date: Mon Mar 7 21:42:44 2016 GsettingsChanges: com.ubuntu.update-manager first-run false com.ubuntu.update-manager launch-time 1457407962 com.ubuntu.update-manager show-details true com.ubuntu.update-manager window-height 604 com.ubuntu.update-manager window-width 599 MarkForUpload: True PackageArchitecture: all ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: update-manager Symptom: ubuntu-release-upgrader-core UpgradeStatus: Upgraded to precise on 2016-03-08 (0 days ago) VarLogDistupgradeTermlog: ** Affects: update-manager (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug dist-upgrade i386 precise running-unity -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1554328 Title: Couldn't calculate upgrade 12.04 LTS to 14 LTS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1554328/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs