Public bug reported:

>do-release-upgrade
>...
>Could not calculate the upgrade 
>An unresolvable problem occurred while calculating the upgrade. 
>...
>Restoring original system state

I had earlier problems with ubuntu mate which I tried to remove
completely, but did not succeed fully.

17.10 is working fine.

cheers, Markus

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubuntu-release-upgrader-core 1:17.10.11
ProcVersionSignature: Ubuntu 4.13.0-46.51-generic 4.13.16
Uname: Linux 4.13.0-46-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.9
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME-Flashback:GNOME
Date: Sun Jul  1 10:49:39 2018
InstallationDate: Installed on 2015-11-19 (954 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to artful on 2018-07-01 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful dist-upgrade

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https://bugs.launchpad.net/bugs/1779533

Title:
  upgrade from 17.10 to 18.04 fails before starting.

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