Mailing the story:
Puppy 5.1 codename Lucid is out- Now is compatible with Ubuntu 10.04 Lucid Lynx package
Puppy Linux 5.1, code-name 'Lucid' as it is binary-compatible with Ubuntu Lucid Lynx packages, has been released. The announcement and release notes say that because of the Ubuntu binary files, the development time to produce program packages that are tested and configured for Lucid Puppy is extremely short.