Hello @Deleuca, can you test if any 32 bit OpenGL application like glxinfo from a 32 bit build of mesa-utils works? Unfortunately, Ubuntu doesn't provide a 32 bit builds of this package on newer Ubuntu, so maybe try unpacking https://packages.ubuntu.com/bionic/i386/mesa-utils/download with an archive utility and using the utility without installing it to the system.
Nothing extracted yet.
I just installed ubuntu and I'm trying to install steam. I downloaded it from the app center, but when I came to open the app, it just wouldn't start (no error message at all). I tried deleting it and do a snap install (sudo snap install steam), but I had the same problem.