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"gksu has been replaced by pkexec, but even pkexec is being deprecated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
No, pkexec per default does not start a graphical application for security
reasons.
If you want to start a graphical application with pkexec, you need a policy in
/usr/share/polkit-1/actions.
But, nowadays, it mostly isn't necessary to start a graphical
application with elevated privileges,
The issue still is open in Ubuntu 18 LTS.
pkexec normally opens a graphical login, but when doing a "su -l
" it prints a selection in the terminal. No matter what
user is then selected, the authentication will fail.
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What can be done to assist in troubleshooting this issue?
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https://bugs.launchpad.net/bugs/1288786
Title:
pkexec does not launch graphical
Same happening to me too after today's update
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.1 LTS"
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I have same problem in Ubuntu 16.04 when I try to start Synaptic Package
Manager.
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https://bugs.launchpad.net/bugs/1288786
Title:
pkexec does not launch
I have exactly the same problem after upgrading from 14.04 to 15.10. I
have two users (referred here as X and Y) in sudo group. When I run
'pkexec bash' from terminal I get following message. It doesn't make any
difference if I try to authenticate as X or Y.
AUTHENTICATING FOR
I am seeing a similar problem with an ubuntu upgrade from 15.04 15.10
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https://bugs.launchpad.net/bugs/1288786
Title:
pkexec does not launch graphical
** This bug is no longer a duplicate of bug 1292868
Polkit support lost: cannot add language
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https://bugs.launchpad.net/bugs/1288786
Title:
pkexec
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