Maybe gwibber-service package should add in their debian/control file a line like this for avoid this issue:
...
Depends: gwibber,
python-dbus, python-gtk2, python-gconf, python-egenix-mxdatetime, python-simplejson, python-webkit,
librsvg2-2, librsvg2-common, python-imaging,
python-xdg, python-mako, python-gtkspell,
...
Maybe gwibber-service package should add in their debian/control file a line like this for avoid this issue:
python- gtk2,
python- gconf,
python- egenix- mxdatetime,
python- simplejson,
python- webkit,
librsvg2- common,
python- imaging,
python- mako,
python- gtkspell,
...
Depends: gwibber,
python-dbus,
librsvg2-2,
python-xdg,
...