Copying the /.gnupg file to the other computer solved the problem - I can encrypt and decrypt messages now. However, something is not clear. For my "front end," I'm using Seahorse (System/Preferences/Passwords and Encryption Keys) and the encryption applet in a panel. The Passwords and Encryption Keys tool provides for export and import of keys, but this seems not to be working correctly. I note also that in Debian Squeeze (gnome desktop), the encryption applet does not provide for both encryption and decryption in the same window. That is, if I begin by receiving an encrypted file, I cannot decrypt it until I have first encrypted something. The applet toggles between encrypt and decrypt. This looks like a bug to me. I would be grateful for some discussion on this. Thanks for the two replies.