Every time when I poweroff/reboot my computer it gives an irritating sound and on my screen I see this text:
Broadcast message from “my computer name” (“current date” ):
The system is going down for reboot/poweroff NOW!
Is here any way to disable this? (At least remove the sound)
There were no such things before.
For the sound
For the messages
systemd 251.2 removes wall messages from suspend
Go to System Settings → Notifications → Applications: Configure → Local System Message Service → Configure Events and uncheck Play a sound
The sound is initiated by systemd - for a desktop system you can use the blacklist pcspeaker option.
For KDE the place is
Bell notification settings can be modified in “System Settings” → “Accessibility Options” → “Bell”.
My mistake, I forgot about Notifications. Fixed 
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