PC boots to terminal and not GUI (loosely related to updates?)

[ralphy]

If by loop you mean that it will bring you back to the Login page after entering your username and password to login, it is likely .Xauthority is/got corrupted or has wrong permissions.

To solve the issue, login via Terminal and rename .Xauthority

Code:

mv /home/$USER/.Xauthority /home/$USER/.Xauthority.old
reboot

The new file will be created for you with correct permission during next login.