Error
Failed to fetch http://security.ubuntu.com/ubuntu/dists/karmic-security/main/binary-amd64/Packages
Solution:
1. Open /etc/apt/sources.list
2. Replace security.ubuntu.com with old-releases.ubuntu.com
So the new link looks like the following:
http://old-releases.ubuntu.com/ubuntu/dists/karmic-security/main/binary-amd64/Packages