Cant open nautilus or gnome terminal on 19.04
Mainly it appears that there's a bug, not sure what it is. It uses masses of system resources which is why you can't open nautilus. I found a reinstall worked
sudo apt-get install --reinstall nautilus
I also found that installing unity worked for other services like terminal.
sudo apt install ubuntu-unity-desktop
It's a work round that works until they fix gnome