Cannot Upgrade to Kubuntu 18.04

I referred to your question in resolving my own here.

My solution was to sudo apt-mark hold kmod after a fresh install of Ubuntu 18.04, then upgrade to 18.04.1.

I haven't tested it, but reverting kmod to version 24-1ubuntu3 from 24-1ubuntu3.1 and holding it there may have the same result (without starting your system over from scratch like I did).

In some cases it might be more than one package, I followed these steps:

1. Check on the file /var/log/dist-upgrade/apt.log for any broken package listed there

2. Remove the package using apt sudo apt remove {broken package name}

3. Run sudo apt autoremove to get ride of residual packages

4. Run sudo do-release-upgrade again if it throws the error message below:

   Could not calculate the upgrade

   An unresolvable problem occurred while calculating the upgrade.

   This was likely caused by:

   • Unofficial software packages not provided by Ubuntu Please use the tool 'ppa-purge' from the ppa-purge package to remove software from a Launchpad PPA and try the upgrade again.

   If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to investigate this yourself the log files in '/var/log/dist-upgrade' will contain details about the upgrade. Specifically, look at 'main.log' and 'apt.log'.

Repeat step 1 to 4