[nmglug] Really annoying beeps

[Tom Ashcraft]

I've got a nice little Acer netbook (maybe twelve years old?) that I use 
mainly for car camping and when I want to use a computer at the library.

The problem is that *sometimes* when I use the 'action button' icon from 
either the 'main menu' or the 'panel' to suspend, shutdown, etc.; or, if 
I have to plugin or unplug the external charger/power supply for 
whatever reason, it emits an ear-splitting beep that makes anyone nearby 
jump right out of their skin and develop an instant case of PTSD.

Does anyone know how I can disable this?

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  $$:      $$.   -    ,d$$'    Shell: bash 5.1.4
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  Y$$.    `.`"Y$$$$P"'         DE: Xfce 4.16
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           `"Y$b._             CPU: AMD C-50 (2) @ 1.000GHz
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                               Memory: 752MiB / 3658MiB

Thanks,

Tom