I have also been having the same problem for a while now. I can't unpin anything in synaptic. Here is my /var/lib/synaptic/preferences
Package: evolution Pin: version 2.2.3-5 Pin-Priority: 1001 ls /root/.synaptic filters lock log options synaptic.conf tmp One way to unpin is to just remove /var/lib/synaptic/preferences. That doesn't seem like a very good solution though.
