Unable to use gdebi-gtk on Wayland session

[Norbert]

Steps to reproduce:
1. Install Ubuntu 17.10.
2. Install gdebi-gtk package
3. Try to install deb-file (for example http://mirrors.kernel.org/ubuntu/pool/universe/s/systemd-ui/systemd-ui_3-4_i386.deb)
4a. Gdebi GUI opens, clicked Install package, entered sudo password, window closes.
4b. In console it prints error messages:

$ gdebi-gtk ~/Downloads/systemd-ui_3-4_i386.deb
No protocol specified
Unable to init server: Could not connect: Connection refused
No protocol specified
Unable to init server: Could not connect: Connection refused
No protocol specified
Unable to init server: Could not connect: Connection refused
Segmentation fault

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gdebi 0.9.5.7+nmu1ubuntu2
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: ubuntu:GNOME
Date: Sun Aug 27 23:17:05 2017
InstallationDate: Installed on 2017-08-26 (0 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha i386 (20170826)
PackageArchitecture: all
SourcePackage: gdebi
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.