Similar problems exist but don't match my problem.
I'm on Ubuntu 22.04. It was a clean install. It seems that I can't do Windows key + E to open file explorer, It did work until very recently. Also, on Firefox, the download window, the one asking you where you want to save doesn't open. I'm pretty sure these events are linked to a same problem but I don't have any idea.
I would appreciate help on this.