You don't actually seem to have the ubuntustudio-desktop package
installed. Please install it and try the upgrade again. Seen in
VarLogDistupgradeMainlog.txt:
76 2020-10-02 08:17:25,545 DEBUG metapkg 'ubuntustudio-desktop' installed but
marked_delete
77 2020-10-02 08:17:25,545 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/1898159
Title:
ubuntu studio dist upgrade failed
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