Changing the user settings to autologin on Lubuntu 16.04 causes LightDM to get stuck in a login loop

[Joel]

After setting my account to login automatically through the user and groups setting in Lubuntu. After the computer reboots it gets stuck in a loop on the login screen. Logging in will just send you back to the same screen.

The only way I could fix the issue was to press CRTL + ALT + F1, logging in through the CLI and typing:
"sudo mv .Xauthority .Xauthority.bak"
and then once I was back to the login screen I was able to login and turn the setting off.

I did check to see weather that was what caused it, by restarting the computer without turning off the auto-login. However the same issue happened and only turning off auto-login would stop the login loop.

[Robert Ancell (robert-ancell)]

What version of Lubuntu / LightDM is this? Can you check the permissions on .Xauthority with ls -l after this occurs?

[Joel (satuim)]

Lubuntu version is 16.04.1 (with latest stable updates) LightDM version 1.18.20ubuntu2. lightdm-gtk-greeter is 2.0.1-2ubuntu4.
I'll check out the permissions later and get back to you.

[Joel (satuim)]

OK I changed my account to an admin in hopes it would stop. But it still gets stuck in the loop as soon as the Auto-Login feature is turned on in Lubuntu.

Anyway, "ls .Xauthority -l" returns with:
-rw------- 1 joel joel 55 Oct 8 12:35 .Xauthority.

[cadet willy (timmyzecat)]

i think it's a bug with graphic driver nvidia/ati..., i had this problem after a security update of this driver.
i removed this driver, reboot my pc and i could login.
after that i installed my graphic driver again

[Launchpad Janitor (janitor)]

[Expired for lightdm (Ubuntu) because there has been no activity for 60 days.]