#44 WaveSurfer 1.8.8p5 help/manual does not show on Ubuntu 20.04 gnome

[Tim (TJ) Snider]

gnome-open no longer exists, should use xdg-open instead:
see the following for more info:
https://askubuntu.com/questions/1254747/how-to-install-gnome-open-in-ubuntu-20-04-desktop