Comment 0 for bug 1713313

Steps to reproduce:
1. Install Ubuntu 17.10
2a. Install backintime-qt4 and menu package (see bug 1713274)
3. 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)
4.1. Back In Time does not start from GUI.
4.2. Back In Time shows error message in console:

$ 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

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)