apt-get remove libsasl2 libssp0
apt-get install libsasl2 libssp0
he'll probably tell you the same crap, just install .. i've been upgrading production servers alot .. most of them throw errors during upgrading, but that's just because of crappy post install scripts .. f.e. if you start start upgrading when having an NFS mount, apt will stop when he wants to upgrade nfs-common and will give a strange error, in which you can't find the problem being nfs-common.
so apt can be very annoying
if it was my server i'd just remove the packages and reinstall them.