```apt list | grep desktop-portal```

 ```sudo apt-get install xdg-desktop-portal-gnome```

 ```sudo apt-get --reinstall install xdg-desktop-portal-gnome```

This relates to [[Firefox wont open file browser via websites|this issue]] I found a batter way to solve that problem. You should install or reinstall one of the packages xdg-desktop-portal* List them on Ubuntu with: ```apt list | grep desktop-portal``` And try to install: ```sudo apt-get install xdg-desktop-portal-gnome``` or reinstall: ```sudo apt-get --reinstall install xdg-desktop-portal-gnome``` It seems you need to rerun DBus to apply changes, but I just restarted my PC. If xdg-desktop-portal-gnome won't help then try to install/reinstall xdg-desktop-portal-gtk and xdg-desktop-portal.