It seems that none of the known meta packages are installed on your
system. Please try installing ubuntu-mate-desktop and then upgrade to
the next release of Ubuntu. From VarLogDistUpgradeMainlog.txt:
2020-07-22 17:08:12,646 DEBUG none of the '['ubuntu-desktop', 'kubuntu-
desktop', 'xubuntu-core', 'xubuntu-desktop', 'ubuntustudio-desktop ',
'mythbuntu-desktop', 'kubuntu-netbook', 'lubuntu-desktop', 'ubuntu-
gnome-desktop', 'ubuntu-mate-core', 'ubuntu-mate-desktop', 'ubuntuk
ylin-desktop', 'ubuntu-budgie-desktop']' meta-pkgs installed
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1888535
Title:
upgrade to 20.04 fails with can't install ubuntu-mate-core message
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