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+Running Xfce from a display manager
+If use you a login manager like GDM or LightDM, you may have two ways to start
+- “Xfce Session” will run a complete xfce session, using Xfce-provided
+ scripts (/usr/bin/startxfce4 which will then run /etc/xdg/xfce4/xinitrc
+ or $HOME/.config/xfce4/xinitrc).
+- “Default session” will run whatever is the default session manager on
+ your system. This is the /usr/bin/x-session-manager alternatives, meaning
+ you can tune it with update-alternatives (8). If you only have Xfce
+ installed on your system, it will default to startxfce4, which will run the
+ complete Xfce desktop environment.
+GDM and LightDM will initialize ConsoleKit so you should be able to manage your
+computer (mount removable devices, suspend, shutdown or hibernate etc.).
+Running Xfce from the console
+If you don't use a login manager but start Xfce from console, you need to take
+care of few stuff in order to get a complete Xfce session with full permission
+(mount, suspend/shutdown/hibernate etc.) This is because Debian now uses
+PolicyKit/ConsoleKit to manage policies for things like device and power
+management. If you run Xfce from a compatible display manager (like gdm or
+lightdm), they'll talk to consolekit so your X session will have the
+authentication tokens, but if you use startx, it won't.
+* only use startx, without any argument
+* don't use a .xinitrc, use .xsession
+This is because ConsoleKit ships an init script
+(/etc/X11/Xsession.d/90consolekit), but the /etc/X11/Xsession.d/ scripts are
+only executed if you don't use any .xinitrc. See startx (1) for more
+Then you need to fine-tune your pam installation so ConsoleKit can be sure that
+your user is correctly authenticated. For that, you need to:
+* install libpam-ck-connector
+session optional pam_loginuid.so
+*before* pam_ck_connector.so in /etc/pam.d/common-session.