Earlier quoted context omitted.
Ubuntu is debian based, and works on .deb packages. Just nitpicking, nothing else to add.
This is true! I wish to add that in my experience (years of use of both), I have found that Ubuntu is significantly lower quality and less stable than Debian. In other words, they squander some of the reliability they could inherit from Debian.
So many annoying bugs. Debian QA is much better, but Red Hat takes the cake. Their attention to even little details is remarkable.