Looking at your VarLogDistUpgradeMainlog.txt it looks like you are
missing the xubuntu-desktop meta package.
2018-08-03 19:16:05,600 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
2018-08-03 19:16:05,600 DEBUG guessing 'xubuntu-core' as missing meta-pkg
2018-08-03 19:16:05,735 DEBUG marked_install: 'xubuntu-core' -> 'True'
Please try installing the xubuntu-desktop package and upgrading again.
Thanks in advance.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Confirmed => Incomplete
** Summary changed:
- Could not calculate the upgrade An unresolvable problem occurred while
calculating the upgrade. This can be caused by: * Upgrading to a pre-release
version of Ubuntu * Running the current pre-release version of Ubuntu *
Unofficial software packages not provided by Ubuntu If none of this applies,
then please report this bug using the command 'ubuntu-bug
ubuntu-release-upgrader-core' in a terminal.
+ Could not calculate the upgrade due to missing xubuntu-desktop metapkg
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https://bugs.launchpad.net/bugs/1785355
Title:
Could not calculate the upgrade due to missing xubuntu-desktop metapkg
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