[Bug 1787367] [NEW] Upgrade from 16.04.5 LTS to 18.04 fails on some items

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Did the apt-get update immediately before the offered upgrade to 18.04.

Went through smoothly until around 98%, when it stated that the update could not be completed and the system might be unstable. It would do some 'configure -a' (if memory serves right), and informed that it could not roll back. Then the upgrade process exited. Then - before manual reboot - I was offered two new updates: movieeditor and feh. I accepted, but stopped when it wanted to remove libcal3, systemd-shim and virtualbox. 
Luckily, after reboot, it came up, but remains not upgradeable. It stops at an uninstallable systemd-shim. Any apt-get update doesn't help. 

Observations throughout the upgrade process: 
1. Early on, it had already popped up a message stating that systemd-shim could not be updated. Though then, I could continue, and did. 
2. While doing the kernel update, it repeatedly warned 'no matching swap device is available'. I had/have no clue why, since I always had one, and have configured a partition as swap space.

Actions: I had accepted at all questions of replacing / keeping conf-s
with 'replace'.

Now I'm looking forward to some help on completing the update, and
removing the old packages (this also stops with systemd-shim).

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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Upgrade from 16.04.5 LTS to 18.04 fails on some items
https://bugs.launchpad.net/bugs/1787367
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