This should be of some help: https://help.ubuntu.com/community/AptGet/Howto
The main thing to worry about with removing apps is that due to dependency relationships between packages (shared resources are usually packaged separately, rather than bundling them as duplicates in each app's package), sometimes removing an seemingly innocuous package can do destructive things if you don't fully understand what it's doing. (Because Linux OSes are modular, it's quite possible (and in some cases desired) to remove half of the OS - and if important things depend on something you're trying to remove, you have to watch out for that sort of thing. In this case, it shouldn't be an issue - it's just fair warning; the App Manager keeps people from doing things like that, which is why it's the way we encourage most people to install/uninstall apps.)
To figure out the name of the package, you can use apt-cache search searchterm