[OpenAFS] Update squeeze openafs-fileserver to squeeze-backports

[Jean-Marc Choulet]

Hello,

We want to upgrade openafs-fileserver to squeeze-backports and we get 
this errors :

LANG=C apt-get -t squeeze-backports install openafs-client
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer 
required:
   bison flex
Use 'apt-get autoremove' to remove them.
Suggested packages:
   openafs-doc
The following packages will be upgraded:
   openafs-client
1 upgraded, 0 newly installed, 0 to remove and 5 not upgraded.
1 not fully installed or removed.
Need to get 0 B/3843 kB of archives.
After this operation, 717 kB of additional disk space will be used.
Reading changelogs... Done
Preconfiguring packages ...
openafs-client failed to preconfigure, with exit status 1
(Reading database ... 38192 files and directories currently installed.)
Preparing to replace openafs-client 1.4.12.1+dfsg-4+squeeze2 (using 
.../openafs-client_1.6.1-3+deb7u1~bpo60+1_amd64.deb) ...
Unpacking replacement openafs-client ...
Processing triggers for man-db ...
Setting up openafs-client (1.6.1-3+deb7u1~bpo60+1) ...
Installing new version of config file /etc/init.d/openafs-client ...
dpkg: error processing openafs-client (--configure):
  subprocess installed post-installation script returned error exit status 1
configured to not write apport reports
                                       Errors were encountered while 
processing:
  openafs-client
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@fs01:~#

Do you any ideas ?

Thank,

Jean-Marc