There is a Debian package in the GNU archive, have you tried it instead? It works fine on Debian Buster so should be ok on a recent Ubuntu I guess (but not tested).
I can try later. What would the command look like? I assume I have to add the package somehow first.
sudo apt install ./package (you have to write it like a file address or it ttys to download it)
It would be that on Debian that already has the package (maybe Ubuntu does as well as they're similar). If not I suppose I'll figure out how to add it to my package manager first.
no, if you download the package that still works. you have to format the package name as a filepath instead of just the name so you have to use that ./ in front of it (assuming you're in the same directory) but that's all the more it needs.