All versions of ubuntu use the apt package manager.
If you are looking for a front end to the package system, many options exist.
First, there is aptitude, which should come pre-installed on your system. Its text base and runs in the console but it's quite good once you get the hang of it.
For graphical package managers there is Adept, which uses the debtags to allow you to search for all available packages to complete a specific task (like database server or irc client)
There is kpackage which is a simple no frills graphical package manager which allows you to install/remove and search for packages.
Finally there is synaptic (Don't get it confused with the laptop touchpad stuff) which is a gtk based interface.
