[Reportbug-maint] Bug#854405: reportbug: Can't start reportbug from XFCE4 Menu

[Mechtilde Stehmann]

Package: reportbug
Version: 7.1.4
Severity: grave
Justification: renders package unusable

If I start it at console as described I get the following error message 

$ reportbug --exit-prompt --ui gtk2
Traceback (most recent call last):
  File "/usr/bin/reportbug", line 2234, in <module>
    main()
  File "/usr/bin/reportbug", line 1084, in main
    if newui.initialize():
  File "/usr/lib/python3/dist-packages/reportbug/ui/gtk2_ui.py", line 1778, in initialize
    gi.require_version('Vte', '2.91')
  File "/usr/lib/python3/dist-packages/gi/__init__.py", line 118, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Vte not available


-- Package-specific info:
** Environment settings:
DEBEMAIL="mechtilde at debian.org"
DEBFULLNAME="Mechtilde Stehmann"
INTERFACE="text"

** /home/mechtilde/.reportbugrc:
reportbug_version "6.3.1"
mode advanced
ui text
email "mechtilde at debian.org"
smtphost "mail.xxxx.de:xx"
smtpuser "xxxxxxx"
smtptls

-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (400, 'testing'), (300, 'unstable'), (200, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages reportbug depends on:
ii  apt                1.4~beta4
ii  python3-reportbug  7.1.4
pn  python3:any        <none>

reportbug recommends no packages.

Versions of packages reportbug suggests:
pn  claws-mail                                 <none>
pn  debconf-utils                              <none>
pn  debsums                                    <none>
pn  dlocate                                    <none>
pn  emacs23-bin-common | emacs24-bin-common    <none>
ii  exim4                                      4.88-5
ii  exim4-daemon-light [mail-transport-agent]  4.88-5
ii  file                                       1:5.29-3
ii  gir1.2-gtk-3.0                             3.22.7-2
pn  gir1.2-vte-2.91                            <none>
ii  gnupg                                      2.1.18-3
ii  python3-gi                                 3.22.0-2
ii  python3-gi-cairo                           3.22.0-2
pn  python3-gtkspellcheck                      <none>
ii  python3-urwid                              1.3.1-2+b1
ii  xdg-utils                                  1.1.1-1

Versions of packages python3-reportbug depends on:
ii  apt                1.4~beta4
ii  file               1:5.29-3
ii  python3-debian     0.1.30
ii  python3-debianbts  2.6.1
ii  python3-requests   2.12.4-1
pn  python3:any        <none>

python3-reportbug suggests no packages.

-- no debconf information