Public bug reported:

running a fresh install of kubuntu 22.04 
plymouth version: 0.9.5+git20211018-1ubuntu3


What should happen:  
Plymouth should totally cover all bootmessages (no bootmessages should be 
printed to console in the first place)

What actually happens: 
When Plymouth quits the last 2-3 messages are visible

on shutdown i get:
[OK] Reached target Late Shutdown Services
[OK] Finished System Power Off
[OK] Reached target System Power off


it seems to be absolutely impossible to hide all boot messages 
i've done everything from this arch wiki site (and more) to get a silent boot: 
https://wiki.archlinux.org/title/silent_boot
(this makes all acpi warnings and more go away.. but the [OK] reached/finished 
messages are not affected by those kernel parameters (this should also be fixed)

My Kernelparameters: 
fbcon=nodefer rd.systemd.show_status=false vt.global_cursor_default=0 quiet 
splash loglevel=3 rd.udev.log_level=3


What part of the system throws these messages ? i thought it is systemd? 
so i even edited files in /usr/lib/systemd/system in order to set the 
StandardOutput to null for all of the halt and reboot and plymouth scripts

and i edited the plymouth start and stop scripts and added -no-boot-log
but plymouth totally ignores this flag and still logs everything to
console and to /var/log/boot.log


this defies the whole purpose of plymouth if plymouth itself spams the console 
with messages and if it's systemd why doesn't it respect the kernel parameters

** Affects: plymouth (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1975421

Title:
  Make Plymouth hide ALL messages on boot, reboot, halt. Plymouth
  ignores --no-boot-log flag

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