I was trying to recompile and rebuild libevent2 source from oneiric on my natty server and I had a small error with gpg not being able to check signature
# dpkg-source -x libevent_2.0.12-stable-1.dsc
gpgv: Signature made Fri Jun 17 07:12:50 2011 PDT using DSA key ID 7ADF9466
gpgv: Can't check signature: public key not found
dpkg-source: warning: failed to verify signature on ./libevent_2.0.12-stable-1.dsc
Any idea how to fix this warning?