Since it seems the beep command is blacklisted in Linux Mint (or rather not loaded by default into the kernel) and it’s ugly af, we can make a better beep.
# beep export BEEP=/usr/share/sounds/LinuxMint/stereo/dialog-warning.ogg alias beep='paplay $BEEP'
then you can run
find . -name somefile && beep
Thanks https://askubuntu.com/questions/19906/beep-in-shell-script-not-working!