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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