Fix Gnome Software Stuck With “Software catalog is being loaded” Message

“Software” is the default Gnome graphical tool for installing applications and extensions. It’s used not only in Linux distributions using the Gnome desktop, but some others as well, like Xubuntu (Xfce-based Ubuntu) for example. Sometimes Gnome Software doesn’t load, getting stuck in the “Software catalog is being loaded” phase. Here is how to fix it.