RasBMC update error

rory@raspbmc:~$ sudo service rpcbind start
[ ok ] Starting rpcbind daemon...[....] Already running..
rory@raspbmc:~$ sudo apt-get update && sudo apt-get upgrade
Hit http://archive.raspbian.org wheezy Release.gpg
Hit http://archive.raspbian.org wheezy Release
Hit http://archive.raspbian.org wheezy/main armhf Packages
Hit http://archive.raspbian.org wheezy/contrib armhf Packages
Hit http://archive.raspbian.org wheezy/non-free armhf Packages
Ign http://archive.raspbian.org wheezy/contrib Translation-en
Ign http://archive.raspbian.org wheezy/main Translation-en
Ign http://archive.raspbian.org wheezy/non-free Translation-en
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
  xbmc
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]? y
Setting up nfs-common (1:1.2.6-4) ...
insserv: Service rpcbind has to be enabled to start service nfs-common
insserv: exiting now!
update-rc.d: error: insserv rejected the script header
dpkg: error processing nfs-common (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 nfs-common
E: Sub-process /usr/bin/dpkg returned an error code (1)