When typing backspace in an empty password box in lightdm, noisy beep sound comes out. Is there a way to mute this beeping?
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One solution is to turn off the beep with xset b off.
This can be made to take effect for the lightdm greeter by adding it to the greeter-setup-script line of the lightdm.conf file at /etc/lightdm/lightdm.conf.
Edit your /etc/lightdm/lightdm.conf config file to look like the following:
[Seat:*]
# ...
greeter-setup-script=xset b off
Gotcha: Ensure that you edit your greeter-setup-script setting in your [Seat:*] table, otherwise the setting won't take affect—see https://linux.debian.bugs.dist.narkive.com/2p9KbtdF/bug-686264-lightdm-greeter-setup-script-not-executed#post6 post.