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'.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1777668
Title:
problem occurred while calculating the upgrade to 18.04
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