You must change the configuration in two places to mute the login sound and mute the system at startup.
Go to the "Settings → Sound" section, select the "Sounds" tab and make sure that the sound effect of the log is turned off.
To mute the system at startup, add the following command to the startup program.
amixer set "Master" is disabled
You can add to the list of boot programs by selecting the following menu item:
System → Settings → Launch Application
reprogrammer
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