I'm on Ubuntu 22.04.1 LTS.
When I reboot/start the system it works perfectly fine, but then after some time the computer has been running if I try to open the file manager it doesn't open anymore.
Trying to opening it via UI just loads for a while and then nothing happens. Running it via command line makes it load a while again and then this message appears (translated from Italian, the message may not be exactly this in English):
Failed to register: Timeout reached
(org.gnome.Nautilus:47297): Tracker-WARNING **: 08:26:44.192: Could not delete '.meta.isrunning': File or directory doesn't exist
Finally, if I run it with sudo nautilus
it works. but of course this means that to open the file manager I have to write that and insert my password.
Now, googling a bit got me to this, and I tried all the things the OP tried and the commented solutions as well. The thing is: I had never run nautilus as root before, so it's not what the first commenter said. No file I could find is owned by someone else than me (the only user on the PC), so it's not that either. Also, the weird thing is that as I said it works for a bit after I first open the PC (sleep mode doesn't count, only starting/restarting the system) but then out of seemingly nowhere it stops.
What can I do?