Sometimes.. No often (I must admit that ) it is irritating to listen to the Beep when people using Linux system and press tab key to auto complete the commands.
A quick way to disable this is to exec command
cmd: sudo modprobe -r pcspkr
This will temporary solve your problem. And in next restart this it will be restored.
Your could also add a line towards the end in file “/etc/modprobe.d/blacklist.conf” which will ensure that system doesn’t beep any more
cmd: sudo echo “blacklist pcspkr” >> /etc/modprobe.d/blacklist.conf
To restore
issue cmd: sudo modprobe pcspkr OR remove the line from /etc/modprobe.d/blacklist.conf blacklist pcspkr
Sreeni's Tech Blog 