I am trying to enable autologin but when I go to System Settings > User Accounts my account is listed as (null) and autologin cannot be enabled.
What should I do ?
You can try to do so using command line. Here's the help page. In particular you need to use,
sudo nano /etc/lightdm/lightdm.conf
and thereafter, add the following lines,
This is slightly different than what's mentioned in help page since that's for older release.
Edit - Here's another answer.