package:kismet:2013.03.R1b-3build1
Setting up kismet (2013.03.R1b-3build1) ...
GdkPixbuf-WARNING **: Cannot open pixbuf loader module file '/usr/lib/i386-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache': No such file or directory

This likely means that your installation is broken.
Try running the command
  gdk-pixbuf-query-loaders > /usr/lib/i386-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache
to make things work again for the time being. at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 148.
Gtk-WARNING **: Error loading theme icon 'window-close' for stock: Unrecognized image file format at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 148.
Gtk-WARNING **: Error loading theme icon 'go-previous' for stock: Unrecognized image file format at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 148.
Gtk-WARNING **: Error loading theme icon 'go-last' for stock: Unrecognized image file format at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 148.
Gtk-WARNING **: Error loading theme icon 'go-next' for stock: Unrecognized image file format at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 148.
usermod: user 'JG' does not exist
dpkg: error processing package kismet (--configure):
 subprocess installed post-installation script returned error exit status 6