Having similar issue as the Mar 31 post on PureOS User Login Fails.
It’s a new machine, experienced the login loop the first time it was rebooted after initial setup. Performed the full update per the Mar 31 recommendation. No apparent effect.
Went through the full update again (0 updated since it was just done). Still no effect.
Tried to login using other options: GNOME, GNOME on Xorg, and System X11 Default, and GNOME classic. They all just hangup with a grey screen and mouse pointer. Can startup Kodi but that is not my interest at the moment.
How to fix the login loop problem?