[Pkg-libvirt-maintainers] Bug#895145: virt-manager: fails to start networks

[Christoph Anton Mitterer]

Package: virt-manager
Version: 1:1.4.3-1
Severity: important


Hi.

Since the most recent upgrade, when I try to start a network from the GUI:
Error starting network 'main': internal error: Failed to initialize a valid firewall backend

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 89, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 125, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 82, in newfn
    ret = fn(self, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/network.py", line 81, in start
    self._backend.create()
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 2947, in create
    if ret == -1: raise libvirtError ('virNetworkCreate() failed', net=self)
libvirtError: internal error: Failed to initialize a valid firewall backend


Cheers,
Chris


-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.15.0-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_DE.UTF-8, LC_CTYPE=en_DE.UTF-8 (charmap=UTF-8), LANGUAGE=en_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages virt-manager depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.26.1-3
ii  gir1.2-gtk-3.0                               3.22.29-3
ii  gir1.2-gtk-vnc-2.0                           0.7.2-1
ii  gir1.2-libosinfo-1.0                         1.1.0-1
ii  gir1.2-libvirt-glib-1.0                      1.0.0-1
ii  gir1.2-vte-2.91                              0.52.0-1
ii  librsvg2-common                              2.40.20-2
ii  python                                       2.7.14-4
ii  python-dbus                                  1.2.6-1
ii  python-gi                                    3.28.1-1
ii  python-gi-cairo                              3.28.1-1
ii  python-libvirt                               4.0.0-1
ii  python-requests                              2.18.4-2
ii  python2.7                                    2.7.14-8
ii  virtinst                                     1:1.4.3-1

Versions of packages virt-manager recommends:
ii  gir1.2-spiceclientglib-2.0  0.34-1.1
ii  gir1.2-spiceclientgtk-3.0   0.34-1.1
ii  libvirt-daemon-system       4.2.0-1

Versions of packages virt-manager suggests:
ii  gir1.2-secret-1  0.18.6-1
ii  gnome-keyring    3.28.0.2-1
pn  python-guestfs   <none>
pn  ssh-askpass      <none>
pn  virt-viewer      <none>

-- no debconf information