Apt problem

[Gmail <marmika2010@gmail.com>]

After upgrading my Libranet (Sarge-based) system, I now end up with the
following messages after doing anything apt-get based (including Synaptic):
 
W: No priority (or zero) specified for pin
W: No priority (or zero) specified for pin
 
However the apt-get commands and apps work.  How do I solve the
problem/warnings?