Please install the ubuntu-desktop package and then try the upgrade
again.
2018-08-23 06:50:14,983 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
2018-08-23 06:50:14,983 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
2018-08-23 06:50:15,413 ERROR failed to mark 'ubuntu-desktop' for install
(E:Unable to correct problems, you have held broken packages.)
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1788605
Title:
18.04 installation failure
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