Greetings,
two of my projects are on the list(SiriKali and zuluCrypt) and latest versions 
of these projects are not affected by the problem.

The latest version of SiriKali is 1.3.0 but the problem was solved in
version 1.2.9. The latest version of zuluCrypt is 5.2.0 and it also does
not have the problem.

SiriKali uses pkexec not to root elevate its GUI component but to
elevate a CLI background service called "siripolkit".

zuluCrypt uses pkexec not to root elevate its GUI components but to
elevate a CLI background service called "zulupolkit".

zuluCrypt 5.2.0-1 in debian/ubuntu is affected by the problem and the
problem is due to debian/ubuntu packaging and i already informed the
maintainer about it,the old way of raising GUI components in zuluCrypt
is no longer supported since version 5.2.0.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to hplip in Ubuntu.
https://bugs.launchpad.net/bugs/1713313

Title:
  Unable to launch pkexec'ed applications on Wayland session

Status in apt-offline package in Ubuntu:
  New
Status in backintime package in Ubuntu:
  Confirmed
Status in budgie-welcome package in Ubuntu:
  New
Status in ettercap package in Ubuntu:
  Confirmed
Status in gdebi package in Ubuntu:
  Confirmed
Status in gnunet-gtk package in Ubuntu:
  Confirmed
Status in gparted package in Ubuntu:
  Invalid
Status in gufw package in Ubuntu:
  New
Status in hplip package in Ubuntu:
  Confirmed
Status in italc package in Ubuntu:
  New
Status in laptop-mode-tools package in Ubuntu:
  New
Status in lightdm-gtk-greeter-settings package in Ubuntu:
  Confirmed
Status in nautilus-admin package in Ubuntu:
  New
Status in needrestart-session package in Ubuntu:
  Confirmed
Status in nemo package in Ubuntu:
  Confirmed
Status in policykit-1 package in Ubuntu:
  Invalid
Status in scanmem package in Ubuntu:
  New
Status in scap-workbench package in Ubuntu:
  Confirmed
Status in sirikali package in Ubuntu:
  New
Status in synaptic package in Ubuntu:
  Confirmed
Status in thunar package in Ubuntu:
  New
Status in tuned package in Ubuntu:
  New
Status in ubuntustudio-controls package in Ubuntu:
  New
Status in ubuntustudio-default-settings package in Ubuntu:
  New
Status in xdiagnose package in Ubuntu:
  Confirmed
Status in xubuntu-default-settings package in Ubuntu:
  New
Status in zulucrypt package in Ubuntu:
  New

Bug description:
  Posting here what gnome says about porting to wayland, and their
  tests:

  GNOME Applications under Wayland
  GTK+ has a Wayland backend. If it was enabled at compile-time, you can run a 
GTK+ application under Wayland simply by:

  GDK_BACKEND=wayland gnome-calculator
  Applications that use Clutter or clutter-gtk also need the Clutter Wayland 
backend enabled:

  GDK_BACKEND=wayland CLUTTER_BACKEND=wayland cheese

  https://wiki.gnome.org/Initiatives/Wayland/Applications

  ======> so hope the settings are well set at compile time; maybe a
  rebuilt to get sure all apps are ok.

  
  
********************************************************************************************************************************************

  Steps to reproduce:
  1. Install Ubuntu 17.10
  2. Install backintime-qt4 or gparted application from above list (full may be 
acquired from 
https://codesearch.debian.net/search?q=pkexec+filetype%3Adesktop+path%3A*%2Fapplications%2F*&perpkg=1&page=4
 )
  3a. Try to launch backintime-qt4 from shortcut "Back In Time (root)" (located 
in /usr/share/applications/backintime-qt4-root.desktop, it uses pkexec
  ($ cat /usr/share/applications/backintime-qt4-root.desktop | grep Exec
  Exec=pkexec backintime-qt4)
  3b. Try to launch Gparted from shortcut "GParted" (located in 
/usr/share/applications/gparted.desktop, it uses gparted-pkexec)
  4a.1. Back In Time does not start from GUI.
  4a.2. Back In Time shows error message in console:
  4b. gparted-pkexec does not start, reports error
  $ gparted-pkexec
  Created symlink /run/systemd/system/-.mount → /dev/null.
  Created symlink /run/systemd/system/run-user-1000.mount → /dev/null.
  Created symlink /run/systemd/system/run-user-121.mount → /dev/null.
  Created symlink /run/systemd/system/tmp.mount → /dev/null.
  No protocol specified

  (gpartedbin:12831): Gtk-WARNING **: cannot open display: :0
  Removed /run/systemd/system/-.mount.
  Removed /run/systemd/system/run-user-1000.mount.
  Removed /run/systemd/system/run-user-121.mount.
  Removed /run/systemd/system/tmp.mount.

  $ pkexec backintime-qt4

  Back In Time
  Version: 1.1.12

  Back In Time comes with ABSOLUTELY NO WARRANTY.
  This is free software, and you are welcome to redistribute it
  under certain conditions; type `backintime --license' for details.

  No protocol specified
  app.py: cannot connect to X server :0

  Expected results:
  * backintime-qt4 may be run as root

  Actual results:
  * unable to run backintime-qt4 as root

  Workaround:
  * setting "xhost +si:localuser:root" helps.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: backintime-qt4 1.1.12-2
  ProcVersionSignature: Ubuntu 4.12.0-11.12-generic 4.12.5
  Uname: Linux 4.12.0-11-generic i686
  ApportVersion: 2.20.6-0ubuntu7
  Architecture: i386
  CurrentDesktop: GNOME
  Date: Sun Aug 27 14:23:14 2017
  InstallationDate: Installed on 2017-08-26 (0 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha i386 (20170826)
  PackageArchitecture: all
  SourcePackage: backintime
  UpgradeStatus: No upgrade log present (probably fresh install)

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