David Ashford's questions

I've been encrypting and decrypting files and folder using nautilus and the seahorse-plugins package for the past few Ubuntu releases. It appears that seahorse-plugins is no longer available in oneiric's repos: see here, and here.

Has it been replaced by another tool?

I've added many PPAs using the add-apt-repository command. Is there a simple way to remove these PPAs? I've checked in /etc/apt/sources.list for the appropriate deb lines but they aren't there.

This is on a server system so a command line solution would be great!