I am reading [*Debian vs. Ubuntu vs. Linux Mint: Which Distribution Should You Use?*](http://www.makeuseof.com/tag/debian-ubuntu-linux-mint-distribution/)

> 
> Ubuntu, on the other hand, is made to include a good combination of
>  new and stable ... Some packages can be used on both distributions,
>  while others are specifically for one or the other
> 
> 
> 

If Ubuntu is based on Debian, how is it more updated? Does it simply use different apt soures? 

Again since it's based on Debian, why are there differences in package compatibility? Does it simply have some different things installed? 

Can I say:

* All Debian packages will work on Ubuntu.
* All Ubuntu packages will work on Linux Mint (based on Ubuntu).