Musescore 3.1.0 on Ubuntu 18.04

I just downloaded Ubuntu on my chromebook in order to get musescore. I was able to download it and change the permissions. It opened once and now it will not let me open it again. I am extremely new to Ubuntu so it could be that... If anyone has any thoughts, I'd greatly appreciate it! (I know it is not still open because I can see all of the other tabs that are currently open)