Thanks for your report.
>From pkexec's man page:
"The environment that PROGRAM will run it, will be set to a minimal
known and safe environment in order to avoid injecting code through
LD_LIBRARY_PATH or similar mechanisms. In addition the PKEXEC_UID
environment variable is set to the user id of the process invoking
pkexec.
As a result, pkexec will not allow you to run X11 applications as
another user since the $DISPLAY and $XAUTHORITY environment variables
are not set.
These two variables will be retained if the
org.freedesktop.policykit.exec.allow_gui annotation on an action is set to a
nonempty value; this is discouraged, though, and should only be used for legacy
programs.
"
So unless you added a specific policy file, this is the expected
behaviour (for ref on x11 you can run GUI apps without a policy file by
passing $DISPLAY and $XAUTHORITY on the command line like this: pkexec
env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY gtkorphan)
I'm closing this report.
** Changed in: perl (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1712477
Title:
cannot open display: at /usr/lib/x86_64-linux-gnu/perl5/5.26/Gtk2.pm
line 126.
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