If you have any gnome-shell extensions installed, please uninstall all of them. Then reboot and tell us if the problem happens again.
Please also look at https://errors.ubuntu.com/user/ID where ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine. Do you find any links to recent problems on that page? If so then please send the links to us.
If you have any gnome-shell extensions installed, please uninstall all of them. Then reboot and tell us if the problem happens again.
Please also look at https:/ /errors. ubuntu. com/user/ ID where ID is the content of file /var/lib/ whoopsie/ whoopsie- id on the machine. Do you find any links to recent problems on that page? If so then please send the links to us.