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
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https://bugs.launchpad.net/bugs/1613038
Title:
No Upgrade possible from 15.10 to 16.xx GNOME
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