ubuntu-bug reports a problem

[Humphrey van Polanen Petel]

executing "ubuntu-bug -w" gives this message

/usr/share/apport/apport-gtk:16: PyGIWarning: Wnck was imported without specifying a version first. Use gi.require_version('Wnck', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import GLib, Wnck, GdkX11, Gdk
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.

This message only appears after upgrading to 16.04 LTS

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: apport 2.20.1-0ubuntu2.1
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
ApportLog:

ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CrashReports:
 640:0:116:4065233:2016-08-05 12:40:38.456902027 +1000:2016-08-05 12:40:39.456902027 +1000:/var/crash/_usr_lib_virtualbox_VirtualBox.0.crash
 644:0:116:0:2016-08-05 12:40:48.861035169 +1000:2016-08-05 12:40:48.861035169 +1000:/var/crash/_usr_lib_virtualbox_VirtualBox.0.upload
 600:109:116:0:2016-08-05 12:42:01.534062401 +1000:2016-08-05 12:42:01.534062401 +1000:/var/crash/_usr_lib_virtualbox_VirtualBox.0.uploaded
CurrentDesktop: Unity
Date: Thu Aug 11 10:28:58 2016
InstallationDate: Installed on 2015-09-08 (337 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
SourcePackage: apport
UpgradeStatus: Upgraded to xenial on 2016-08-05 (5 days ago)