At this stage Blackberry only release binaries for Webworks for Windows and MacOS, so if you are a linux user then you are on your own. It's not that you can't use the tools though, but you do need to do a little more legwork to get things going.
While there is no binaries available for linux, the NDK it would seem does have an installer, so head on over to http://developer.blackberry.com/native/download/ and install it.
TBC