I can't change any settings nor install anything using the xfce GUI on my xubuntu 14.04. Some setting-windows have that unlock button you usually click to enter your password to gain root privileges, but nothing happens if i click on them:
When starting up that machine, it asks for the installation of language stuff. When I try to install that, I get this error:
How can I fix this?
I just tried to start
/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1 as suggested here but it fails:
xubuntu-pool-1 vm-admin # /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1 (polkit-gnome-authentication-agent-1:3863): GLib-CRITICAL **: g_variant_new_string: assertion 'string != NULL' failed (polkit-gnome-authentication-agent-1:3863): polkit-gnome-1-WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
Actually, it doesn't seem to fail. It doesn't return to the bash prompt but the unlock and install doesn't work anyway.
I also made sure that "PolicyKit Authentication Agent" is checked in startup.
I just found out, that this issue only happens when logged in via xrdp. If I'm on the local vmware console (this machine is virtual), it works just fine. So the issue must have something to do with xrdp.
Output of that polkit command using normal user:
$ /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1 ** (polkit-gnome-authentication-agent-1:4540): WARNING **: Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject Cannot register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject
This output is the same for the command beeing run without and with sudo.