>From VarLogDistupgradeMainlog.txt:

2019-08-11 14:25:56,481 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', 'ubuntukylin-desktop']' meta-pkgs installed
2019-08-11 14:25:56,481 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
2019-08-11 14:25:56,546 ERROR failed to mark 'ubuntu-desktop' for install 
(E:Unable to correct problems, you have held broken packages.)

Please try reinstalling the ubuntu-desktop package and then upgrading.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1839786

Title:
  upgrade from 16.04 LTS to 18.04 Bionic Beaver fails - report says  it
  is impossible to install a required package.

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