Fixing a half-configured package

[sirquijote@lavabit.com]

Hi,

Debian 6.0.7 Stable

Sorry, I've been trying to figure this out for myself and got nowhere. 
I'd like to fix it sooner than later because every time I run any
aptitude/apt-get commands it shows the same warnings and clutters the
screen.

nfs-kernel-server appears to be half-configured ("C") according to
Aptitude.  I'm not sure what to do about this so I tried:

aptitude reinstall nfs-kernel-server

This just gave me the same warnings as before:

>>CODE<<
The following packages will be REINSTALLED:
    nfs-kernel-server
 0 packages upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 15
not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.
Setting up nfs-kernel-server (1:1.2.2-4squeeze2) ...
insserv: warning: script 'K01usercommands' missing LSB tags and overrides
insserv: Service nfs-common has to be enabled to start service
nfs-kernel-server
insserv: exiting now!
update-rc.d: error: insserv rejected the script header
dpkg: error processing nfs-kernel-server (--configure):
 subprocess installed post-installation script returned error exit status 1
configured to not write apport reports
                                      Errors were encountered while
processing:
 nfs-kernel-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
Setting up nfs-kernel-server (1:1.2.2-4squeeze2) ...
insserv: warning: script 'K01usercommands' missing LSB tags and overrides
insserv: Service nfs-common has to be enabled to start service
nfs-kernel-server
insserv: exiting now!
update-rc.d: error: insserv rejected the script header
dpkg: error processing nfs-kernel-server (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 nfs-kernel-server
>>\CODE<<

How do I resolve this?  NFS is, for the time-being, necessary, though I'll
shortly be replacing it with Netatalk (fingers-crossed).