errors in Update Manager

Sat Nov 20 16:34:36 UTC 2010

While running Update Manager I received the following:

W: Failed to fetch 
http://security.ubuntu.com/ubuntu/pool/main/o/openssl/libssl0.9.8_0.9.8k-7ubuntu8.3_amd64.deb
   404  Not Found [IP: 91.189.92.166 80]

W: Failed to fetch 
http://security.ubuntu.com/ubuntu/pool/main/o/openssl/openssl_0.9.8k-7ubuntu8.3_amd64.deb
   404  Not Found [IP: 91.189.92.166 80]

How should I proceed now?