Scrolling back it looks like the first error encountered was this :
-------------------------
Setting up securityonion-pfring-module (20121107-0ubuntu0securityonion10) ...
Creating symlink /var/lib/dkms/pf_ring/5/source ->
/usr/src/pf_ring-5
DKMS: add completed.
Kernel preparation unnecessary for this kernel. Skipping...
Building module:
cleaning build area....
make KERNELRELEASE=3.11.0-15-generic -C /lib/modules/3.11.0-15-generic/build M=/var/lib/dkms/pf_ring/5/build......(bad exit status: 2)
Error! Bad return status for module build on kernel: 3.11.0-15-generic (i686)
Consult /var/lib/dkms/pf_ring/5/build/make.log for more information.
FATAL: Module pf_ring not found.
dpkg: error processing securityonion-pfring-module (--configure):
subprocess installed post-installation script returned error exit status 1
-------------------------------
JonH
Jon