Public bug reported:
Could not calculate the upgrade An unresolvable problem occurred while calculating the upgrade. This can be caused by: * Upgrading to a pre-release version of Ubuntu * Running the current pre-release version of Ubuntu * Unofficial software packages not provided by Ubuntu If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: update-manager 1:0.156.14.19 ProcVersionSignature: Ubuntu 3.2.0-50.76-generic 3.2.48 Uname: Linux 3.2.0-50-generic i686 ApportVersion: 2.0.1-0ubuntu17.14 Architecture: i386 Date: Sun Jan 31 20:42:11 2016 GsettingsChanges: com.ubuntu.update-manager first-run false com.ubuntu.update-manager launch-time 1454290316 com.ubuntu.update-manager show-details true InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429) 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 2016-02-01 (0 days ago) VarLogDistupgradeTermlog: ** Affects: update-manager (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug dist-upgrade i386 precise running-unity third-party-packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1540189 Title: Not able to update from 12.04 to 14.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1540189/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs