Comment 0 for bug 1732185

Test Case:
1. Install 17.10 and all the updates available
2. Start a wayland session (Ubuntu in GDM)
3. open a terminal and run the following command:
  $ update-manager -cd
4. When you're prompted to upgrade to 18.04, accept and proceed.

Expected result
Upgrade starts

Actual result
This crash.

ProblemType: Crash
DistroRelease: Ubuntu 17.10
Package: ubuntu-release-upgrader-core 1:17.10.8
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CrashDB: ubuntu
Date: Tue Nov 14 14:27:30 2017
ExecutablePath: /usr/bin/do-release-upgrade
ExecutableTimestamp: 1508803676
InstallationDate: Installed on 2017-11-14 (0 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
InterpreterPath: /usr/bin/python3.6
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/do-release-upgrade --frontend=DistUpgradeViewGtk3 -d
ProcCwd: /root
Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 2.7.14-2ubuntu1
SegvAnalysis: Skipped: missing required field "Disassembly"
Signal: 11
SourcePackage: ubuntu-release-upgrader
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: