Modrinth on Linux is a mess. When I originally downloaded it about a year ago, it was extremely slow and would freeze up. Now it's just a gray screen that I can't interact with. If you really need the launcher, I would NOT recommend the flatpak app whatsoever. The AppImage and DEB work...fine, they just will sometimes crash when editing a profile (and you also need to force Sudo privaleges to update it, which is bothersome). If you don't want that, just use Prism Launcher.

It's super slow, laggy, and the longer it's on the worse it gets. Just sitting there doing nothing it uses anywhere from 2.5 to 3.8 gigs of ram, and 5-8% cpu. Literally doing nothing and it's taking up that much resource to barely function.

When I install it and try to start it, I just get stuck on a white screen, but it works with the .AppImage file from the website.