Find the *.oga files here
/usr/share/sounds/Yaru/stereo/

Technical notes, and other ideas.
Find the *.oga files here
/usr/share/sounds/Yaru/stereo/
When using menu libre you want it to pickup the new application settings, right away.
#!/bin/bash
# Show a notification that the app is launching
notify-send "Refreshing ~/.local/share/applications/"
update-desktop-database ~/.local/share/applications/
GUI Text Search Tool
sudo apt install searchmonkey
If the application icon is missing, try the following:
sudo nano /usr/share/applications/searchmonkey.desktop
Use the following image, verify it exists.
/usr/share/icons/hicolor/48x48/apps/searchmonkey.png
Problem: Ubuntu Lite keeps asking to unlock keyring
Solution: Unlock the keyring and/or change its password to match logon
$ sudo apt-get install seahorse
Refer: https://askubuntu.com/questions/867/how-can-i-stop-being-prompted-to-unlock-the-default-keyring-on-boot
Linux Lite kept turning on Num Lock and making logon confusing, because numbers were accidentally being used.
Refer: https://www.linuxliteos.com/forums/installing-linux-lite/don%27t-want-numlock-enabled-on-login-screen/
$ nano /etc/lightdm/lightdm.conf
Change this line to off:
greeter-setup-script=/usr/bin/numlockx on