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If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread: CentOS2Alma discussion
Allright, thanks for clearing that up. You might want to include this info in your documentation. ;)
I'll try the upgrade to 16.04 again soon and post back in a new thread if i run into anything odd.
I'd like to point out that https://kb.plesk.com/en/126808 specificly says "Applies to: Plesk 12.5 for Linux". It also explicitly states that Plesk 12.5 does not support Ubuntu 16.04.
There is however an other article here...