Comment 10 for bug 1850933

After seeing that it even affects 16.04 -> 18.04 I was wondering and looked for prior reports.
I found [1][2] and many similar, but no bug report.

[1]: https://www.digitalocean.com/community/tutorials/how-to-upgrade-to-ubuntu-18-04
[2]: https://ubuntuforums.org/showthread.php?t=2393823