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Here are the facts:

I ran some stress-tests last night.    
I forgot to reset the logs to minimal.
When I got this morning, I saw that hard drive is full /dev/sda1.
Cleaned up the large file (350GB).
I experienced the machine being a bit slowlier than usual.
I rebooted the machine.

Since then, when I try to login, the computer shows as if it let me in, and yet, prompt for login again.

If I provide the wrong password on purpose, it shows the usual error. When I provide the right one, it is like an infinite loop.

When I hit Ctrl+Alt+F1 and login at tty1, for instance, all works fine.

From tty1, I tried to setup auto-login as follows:

sudo vim /etc/lightdm/lightdm.conf
autologin-user=<username>
autologin-user-timeout=0

Yet, it doesn't perform the auto login for some reason.

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