Public bug reported: Now I have installed Ubuntu 14.10 I try to upgrade ubuntu to 15.4 but I have this error.
ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: ubuntu-release-upgrader-core 1:14.10.10 ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8 Uname: Linux 3.16.0-34-generic x86_64 ApportVersion: 2.14.7-0ubuntu8.4 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: Unity Date: Sun Apr 26 10:02:03 2015 InstallationDate: Installed on 2014-07-25 (274 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to utopic on 2015-04-26 (0 days ago) VarLogDistupgradeTermlog: ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug dist-upgrade utopic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1448615 Title: Impossible upgrade ubuntu to 15.4 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1448615/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs