Comment 52 for bug 221363

Milan: sorry for the confusion, I did check with an apt-cache show system-tools-backends and man polkit-config-file-validate but nothing in there suggested whether these files are complementing, obsolete or conflicting with policykit-1
As for the problem: it is the same as the one detailed above in the thread, i.e. several GUI admin functions including mounting removable drives and local encrypted partitions do not work when connecting with the NoMachines NX server. Everything is fine from the local Gnome session, or in a terminal.
I have tried the workarounds suggested, and none works.