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