I noticed in Ubuntu 11.10, that finally there is possible to log in with guest account already from log in screen. The last step is remaining - how to enable the guest account automatically log in, e.g. when computer starts? This would be very helpful for public computers, e.g. in libraries, schools, universities, student campus etc. This would be workaround for user account deep freeze feature, which is still missing from Ubuntu.
The lightdm config file location has changed in Ubuntu 14.04. To accomplish the same you need to create a new file /usr/share/lightdm/lightdm.conf.d/50-auto-guest.conf, for example by running
and putting in this content:
For Ubuntu 14.10 this is what worked for me:
with the following content
What did not work for me...
According to the LightDM wiki entry, the right place to put such modifications is in
The following path is for the system-provided configuation only
The way I solved this was 'brute force'. I knew that I could set an auto-login using a regular account in Ubuntu 14.10 so I did that in Settings. Then I looked in the three locations I knew of where the auto-login preference was stored and, voila, the file /etc/lightdm/lightdm.conf was created with a single entry for the account that was subject to auto login. Figuring that less is more I commented out the entry (prefixed #) and added only autologin-guest=true and it worked!
PS pico (& nano) is my preferred command-line text editor (I've been using it so long that I can't change). Use your preferred text editor (e.g. gksu gedit).
Solution suggested by JumpingJuniper works for me too, but only following all of his path.
you must enable autologin for one user using graphical interface. ...or find where you need to change something else. I checked every /usr/share/lightdm/lightdm.conf.d file without success