Really? On Mac you have to go over to internet and download dmg then copy it in to app folder where in Ubuntu:
just type terminal : sudo apt-get install "app-you-need" and it does it for you
And to remove app from mac you have to go to app folder search for it and delete it manually ( and if you want to remove all setting you have to go and search for it in five more folders...)
Where in Ubuntu you just go to Ubuntu SW center and click remove..
terminal : sudo apt-get remove "app-you-dont-need" and it will remove all app settings too!
So while you have downloaded your dmg Ubuntu terminal will be finished installing an app!
I have a MacBook Pro with OS X Lion which is dual booted with Ubuntu 12.10 and Ubuntu boots much faster that OS X..