problem occurred while calculating the upgrade to 18.04

[Bahman Shamsini]

16.04.4 => 18.04

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.13.0-45.50~16.04.1-generic 4.13.16
Uname: Linux 4.13.0-45-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Tue Jun 19 19:27:21 2018
InstallationDate: Installed on 2017-07-05 (349 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-06-19 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2018-06-19T14:07:03.583899

[Brian Murray (brian-murray)]

Your upgrade attempt was actually to Ubuntu 17.10 not Ubuntu 18.04.

2018-06-19 19:21:44,699 DEBUG plugins for condition 'artfulPostInitialUpdate' are '[]'
2018-06-19 19:21:44,699 DEBUG plugins for condition 'from_xenialPostInitialUpdate' are '[]'

If you want to upgrade to Ubuntu 18.04 you'll need to set "prompt=lts" in the file /etc/update-manager/release-upgrades. It also looks like you have a gnome3 PPA enabled. You may want to disable and remove it using the tool ppa-purge from the package 'ppa-purge'.

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]