I think that something has gone slightly wrong with a recent update, though I can't tell you which one right now, (I have another PC at work which lags a little behind on updates, so maybe I could be more precise tomorrow.)
I noticed --just today-- that all my launchers which run programs as super-user (e.g. synaptic, gparted...) have stopped working.
Since the command is typically program_name-pkexec, I tried from a terminal. The output is like that;
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daniel@e6330d:~$ gparted-pkexec Cannot find diversion for /usr/bin/pkexec - exiting
TIA for any help - best regards, Daniel