That last comment is correct and can be further verified in the docs:
https://help.ubuntu.com/community/RootSudo
"gksu has been replaced by pkexec, but even pkexec is being deprecated
by the mainline Ubuntu developers. They have taken the position that
file manipulation and editing under root should be restricted to the
command line.
We can only surmise what the motives were behind this decision: perhaps
there are just too many users who run into problems running graphical
apps as root. In any case, running graphical apps as root now requires
workarounds and additional steps."
** Changed in: policykit-1 (Ubuntu)
Status: Confirmed => Won't Fix
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Packages, which is subscribed to policykit-1 in Ubuntu.
https://bugs.launchpad.net/bugs/1288786
Title:
pkexec does not launch graphical authentication
Status in policykit-1 package in Ubuntu:
Won't Fix
Bug description:
Installed Trusty Tahr Lubuntu Beta1 version and added xubuntu desktop. In
buth desktops, I tried to launch synaptic to install some packages. If I try
to launch from menu, nothing seems to happen. From a terminal, I ran
pkexec "/usr/sbin/synaptic"
and saw that it asks for password in the terminal window, instead of popping
up an authentication window like previous Ubuntu version did. That was why I
saw no authentication request when launching from menu.. I have a
workaround)launching from Terminal window), but this should be fixed before
release.
ralph@minnie:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu Trusty Tahr (development branch)"
ralph@minnie:~$ pkexec --version
pkexec version 0.105
Thanks
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