With gdm3, I was able to remove the last connected users from the list by removing the file '/var/log/ConsoleKit/history'
With lightdm, the last users appears even when :
- removing /var/log/ConsoleKit/history
- removing /var/lib/lightdm/.cache/unity-greeter/state
Where does lightdm store this list ?
It seems like it's using the content from the
last command. Then purging the content of the file
/var/log/wtmp is sufficient to remove any previously connected user from the list :
# > /var/log/wtmp
But, after doing this, I have the unwanted side effect that users loging in via lightdm doesn't appears at all in this list.
I must say that I'm in a enterprise network environment using NIS.
Edit2: Well, it seems that lightdm uses wtmp to display recent network users list, but does not update it. So, lightdm will show a network user only if it logged in in another fashion (ssh, login), like I did on this computer before. cf:
I just added the following line to the file
/etc/pam.d/lightdm To force lightdm to store users in wtmp :
session optional pam_lastlog.so silent