View source for Enable Guest Logins in Ubuntu 18.04 Bionic

By default Ubuntu 18.04 ( non-Groovix )  no longer offers guest logins by default.   But you can enable guest logins by switching the display manager from gdm3 to lightdm and enabling guest logins with the following steps.

<ul>
<li>
sudo apt install lightdm ; # be sure to choose lightdm as the default greeter

<li>
sudo gedit /usr/share/lightdm/lightdm.conf.d/50-disable-guest.conf ; #change it to:

allow-guest=true
NOTE: 
There is a note about bug CVE-2017-8900 , https://bugs.launchpad.net/bugs/1663157 , but I tested it with:

cat /proc/self/attr/current

and it seems to be fixed even though the bug report is not updated.

<li>Reboot the computer ( through the gui or shutdown -r now ) 
</ul>