I have Linux Mint 14 Xfce (4.10) and have also installed LXDE desktop, so I can choose between these sessions if I want. Normally I would set one as default and at startup I am not asked for username&password and am logged in automatically as intended.
(Under Settings/Login Window/Security - "Enable automatic login" is checked; and have also verified that
/etc/lightdm/lightdm.conf contains the line
But even before installing LXDE I was asked for username and password after logout despite the fact that in Settings/Users and Groups I have the setting of not being asked for password on login.
/etc/mdm/mdm.conf I see the line:
(Settings/Session and startup/General - 'Display session chooser' is unchecked. But this regards the other type of 'session': not the first type that involves selecting between users-passwords-desktops, but the one that involves selecting between sets of saved settings of the same user and desktop. More on this distinction/confusion here.)
I find it odd that if I restart the computer I can enter default session without password, but if I just log out the username&password are needed to log in. Opening computer and entering default session/DE: no username&password; selecting between sessions: username&password needed.
In the future I might decide to activate password at startup but I still don't want a password being asked in order to change or re-enter a session after the system has started.
Are there other settings to make?