Just tried to do apt-get upgrade and find that apt can't upgrade ssidsniff package. I tried to give the forum the pastebin url but the site won't permit me.
The problem is that the installer is trying to overwtie /usr/bin/pcapdump which belongs to pcaputils package.

I solved the conflict by removing pcaputils doing;
dpkg -r pcaputils then doing apt-get −f install again and all was well.

I may or may not reenstall pcaputils….nah probably not ;-)