Public bug reported: done this steps sudo apt-get update sudo apt-get upgrade sudo apt-get -f install sudo apt-get -y install apt sudo do-release-upgrade
results in that no upgrade is possible with this error message "An unsolvable problem occurred while determining the system update" ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: ubuntu-release-upgrader-core 1:15.10.14.4 ProcVersionSignature: Ubuntu 4.2.0-42.49-generic 4.2.8-ckt12 Uname: Linux 4.2.0-42-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: GNOME Date: Sun Aug 14 11:51:09 2016 EcryptfsInUse: Yes InstallationDate: Installed on 2016-04-11 (124 days ago) InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Release amd64 (20151021) PackageArchitecture: all ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to wily on 2016-08-14 (0 days ago) ** 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/1613038 Title: No Upgrade possible from 15.10 to 16.xx GNOME To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1613038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs