Problems with version 6.0

Did you make a xinitrc? What is the Exec parameter in /usr/share/xsessions/xfce4.session ? It should be startxfce4 instead of xfce4-session.

Look, everything is okay.

The rule allow send_interface="org.freedesktop.Hal.Device.SystemPowerManagement", in /etc/dbus-1/system.d/hal.conf relates to rebooting/halting the system. It is included in a section specifying a group of users who are allowed to do power management. In Trisquel 5.5 Brigantia, this group is named "powerdev" (policy group="powerdev").

By reading /etc/dbus-1/system.d/hal.conf, check whether the group is still named "powerdev" in Trisquel 6.0 Toutatis. Then see if you are in this group by executing:
$ groups

If not, it is only about adding your user name ("crismblog" in the command below) at the end of the line of /etc/group that starts with "powerdev" (or the other group name if it changed between Trisquel 5.5 and 6.0). To do so, you need administrator privileges:
$ sudo sed -i '/^powerdev:/ s/$/,crismblog/' /etc/group

You could also do that with a text editor but a command is much "kooler". :-)

I tried out the 20121119 ISO last night and I feel the release has the same problems as 5.5 that weren't resolved. Unity/Unity 2D still do not show up as DE options when you log into the computer after installation and Gnome Session Fallback is still clunky and hard to configure. It really is time to start thinking about an alternative desktop environment if Trisquel wants to maintain that classic Gnome 2 style look. The fallback mode is even going away in the Gnome 3.8 series. Maybe MATE or XFCE?

@Magic Banana
I did as you suggested and it did not work

I remember that problem with xfce in debian. What's your display manager? Because I had that issue with slim but not with gdm.

I installed LightDM and now I go all buttons.
Thank you jbar