I have re-installed the system and I try to fix/change Plymouth configurastion, as the resolution is very low and during boot scrambled texts are displayed until I press <F3>.
In KDE, at bootspalsh setting, I get the following error:
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Unable to authenticate/execute the action: 9, Cannot start initramfs.
What could be done, I need to get a highier resolution and a simple kernel log during boot?