This didn't start out as a problem with the login loop. I was attempting a clean install of Ubuntu 16 and using the new feature that allows it to detect proprietary drivers for me.
I started off with this issue
When I attempted to use the recommended Nvidia Drivers, it caused the laptop to become unstable and freeze.
I attempted the remedy from that post and it resulted in a login loop.
I have attempted this
sudo mv ~/.config/dconf/user ~/.config/dconf/user.old
sudo mv ~/.Xauthority ~/.Xauthority.backup sudo service lightdm restart
I have tried locating and disabling secureboot, but there is no secureboot option in the bios. This is an HP DV2000 series laptop.
Nothing is helping
Can someone help?
Guest session does the same loop.
/var/log/Xorg.0.log shows a lot of stuff, but I took a pic of what seems relevant Here
Thing is the driver I first tried that started this mess was 304 drivers and the 364 drivers were supposed to be the fix according to other posts.
I purged the nvidia files and it came back to a blank desktop w/o the interfaces so I right clicked and restored a backup.. The sidebar came back and it was running gallium. I restarted and its the blank purple screen again.
I am thinking of just reinstalling and not using nvidia drivers. The software center is telling me I have a presario and i should use 304 drivers. Its not a presario. =( At least the software center provides a suggestion for the coprocessor driver which is nice.