Problem with procps 1.31.9-1

[Neilen <brick@adept.co.za>]

Hi.

I'm running sid.  For the last couple of days, apt-get dist-upgrade give
me the following error:

Unpacking replacement procps ...
dpkg: error processing
/var/cache/apt/archives/procps_1%3a3.1.9-1_i386.deb (--unpack):
 unable to make backup link of `./bin/ps' before installing new version:
Operation not permitted
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Setting kernel variables..
Errors were encountered while processing:
 /var/cache/apt/archives/procps_1%3a3.1.9-1_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

What might be causing this?

Thanks
Neilen
-- 
Neilen <brick@adept.co.za>