I also noticed, that I can mount external USB drives in Thunar, but I
cannot mount partitions on the internal hard disk drive, which require
root privileges. Then I get the same error message: "Authentication failed".
The problem with Xfce and Thunar is, that they use gvfs and policykit,
but they don't provide any policykit authentication agent. This agent is
what displays the authorization dialog. It is usually left to the
desktop environment to provide a policykit authentication agent, because
it should match the user interface of the other applications:
LXDE uses lxpolkit (GTK2)
https://packages.debian.org/stretch/lxpolkit
LXQt uses lxqt-policykit (Qt5)
https://packages.debian.org/stretch/lxqt-policykit
MATE uses mate-polkit (GTK3)
https://packages.debian.org/stretch/mate-polkit
GNOME uses policykit-1-gnome (GTK3)
https://packages.debian.org/stretch/policykit-1-gnome
Xfce just doesn't have any policykit authentication agent. I searched
for it, but I didn't find any.
Actually, lxpolkit works fine for Xfce, because it also uses GTK2 and is
rather lightweight. It is not started automatically, because the file
/etc/xdg/autostart/lxpolkit.desktop has the line "Hidden=true" in it. If
it is launched manually, it will provide the authorization dialog for
Thunar, and then I can mount any partitions, which requires root privileges.
Any other policykit authentication agent will also work, because they
all use the same dbus interface.
So, to completely reveal this bug, you should do these steps:
1) Quit any other policykit agent, which may be running
2) Try to mount a partition in Thunar, which requires root privileges.
This should fail at this point.
3) Launch lxpolkit
4) Try again to mount the partition. lxpolkit shows the dialog to enter
the root password.
I'm sure, that in Debian 8 Jessie, somehow policykit-1-gnome would be
installed. Then at least one working authentication agent would be
available. But with its dependency on GTK3, it was not the best solution
for lightweight desktop environments.
Regards,
Hartmut Buhrmester
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