Public bug reported: 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. Even though internet connection is fine, it is saying failed to connect net; check your internet connection. etc. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: ubuntu-release-upgrader-core 1:0.220.9 ProcVersionSignature: Ubuntu 3.13.0-101.148-generic 3.13.11-ckt39 Uname: Linux 3.13.0-101-generic i686 ApportVersion: 2.14.1-0ubuntu3.27 Architecture: i386 CrashDB: ubuntu CurrentDesktop: Unity Date: Wed Feb 21 10:16:47 2018 InstallationDate: Installed on 2014-01-14 (1498 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to trusty on 2018-02-21 (0 days ago) VarLogDistupgradeTermlog: ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug dist-upgrade i386 third-party-packages trusty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1750723 Title: Unable to Upgrade to 16.?? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1750723/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs