The user's home directory was encrypted, so signing in without a
password is not valid.
** Changed in: lightdm (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1511
The relevant parts from the LightDM log are:
[+1.01s] DEBUG: Seat seat0: Display server ready, starting session
authentication
[+1.01s] DEBUG: Session pid=857: Started with service 'lightdm-autologin',
username 'bouncysteve'
[+1.09s] DEBUG: Session pid=857: Authentication complete with return va
