pwfeedback option causes "Conversation with su failed" for the KDE partition manager

Starting with Kubuntu 18.04, the pwfeedback option in /etc/sudoers
causes the "Run as root -- KDE su" dialogue to fail.  (This may have
come about as a consequence of the deprecation of kdesudo, and those
systems that have been upgraded from versions that still have kdesudo
might not encounter this.)

I'm not sure this is a sudo issue, but it's good if searches find it,
as those who are affected by it may have no clue that /etc/sudoers has
anything to do with it, if it had not been changed recently.

The dialogue box shows the command as:

KDE_FULL_SESSION=true XDG_RUNTIME_DIR=/run/user/1000
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
/usr/bin/partitionmanager --dontsu

visudo does not highlight pwfeedback as an option, perhaps it is
deprecated.  The password feedback does work for terminal sudo.

Regards, John Little
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