Ubuntu core package
We know Red Hat use .rpm packages and Debian uses .deb packages, what is the core package that was used in ubuntu. I know ubuntu will support .deb but i want to know which one is core package.
Ubuntu core package
===

We know Red Hat use .rpm packages and Debian uses .deb packages, what is the core package that was used in ubuntu. I know ubuntu will support .deb but i want to know which one is core package.