Today, I have updated my Ubuntu 18.04 machine to 20.04. I have noticed that the bell/alert sound has changed. I personally much preferred the old bell sound (used at least in 18.04 and I think also in 16.04) and would like to change it back if possible.
I am already aware of the 'Alert sound' section of the 'Sound' page in Settings. This only allows me to choose between five different options (Default, Bark, Drip, Glass and Sonar). None is the one I want.
EDIT: I've already located the old bell sound on the computer (it's still in the files, at /usr/share/sounds/ubuntu/stereo/bell.ogg), so now I only need to know how to set a custom alert sound.
