Sorry, that was a wrong link. Here's the correct one:
https://askubuntu.com/questions/766973/16-04-how-to-uninstall-plymouth
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https://bugs.launchpad.net/bugs/1766095
Title:
plymouthd co
Well, it's quite frustrating that the bug still persists even on 18.04. I'm
using Xubuntu 18.04 with updates installed and the plymouthd had 25% CPU usage
on ThinkPad T43p. I found a workaround on how to disable it. The process won't
bother you again.
https://askubuntu.com/questions/407131/why-i