I make a choice to install Ubuntu using an alternate CD/DVD with the minimal installation option. After that I run a shell script that will install my favourite desktop environment and applications.
Now it's time to upgrade my Ubuntu version to a new one. But I think that if I do so, that the Ubuntu upgrade procedure will install Unity and many other Ubuntu applications that I don't like and don't need.
Is there a way to not allow the upgrade script to install any Ubuntu default applications, just upgrade the core and my already installed applications?