08-22-2020, 05:36 PM
Promise - one last try 
Hate to be beat.
The problem might be the .desktop file you made is not executable.
A bit of fidle but I got menulibre (from a 18.04 deb) installed in 20.04
The usual (same as alacarte ) never creates with the correct menu name, but that fixed from the applications menu.
The attached as close as I can get to your installation. You will need to edit the paths a little. As before goes in ~/.local/share/applications
Hate to be beat. The problem might be the .desktop file you made is not executable.
A bit of fidle but I got menulibre (from a 18.04 deb) installed in 20.04
The usual (same as alacarte ) never creates with the correct menu name, but that fixed from the applications menu.
The attached as close as I can get to your installation. You will need to edit the paths a little. As before goes in ~/.local/share/applications