Please install the ubuntu-desktop metapackage and then try the upgrade
process again. In VarLogDistUpgradeMainlog.txt we can see the following:
2019-06-05 09:29:38,723 DEBUG none of the '['ubuntu-desktop',
'kubuntu-desktop', 'xubuntu-core', 'xubuntu-desktop', 'ubuntustudio-desktop',
'mythbuntu-desktop', 'kubuntu-netbook', 'lubuntu-core', 'lubuntu-desktop',
'ubuntu-gnome-desktop', 'ubuntu-mate-core', 'ubuntu-mate-cloudtop',
'ubuntu-mate-desktop']' meta-pkgs installed
2019-06-05 09:29:38,723 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1831708
Title:
New LTS version installation stopped on error
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