The reason you can't find a DL link is because there isn't one. If you read carefully it reads "Linux version: Currently not planned."
There is however a fantastic solution on OSX called eMux, but obviously that's out of the question if you're on Linux. The only other option is running it in Windows, using something like Wine - or maybe running a version of windows VirrtualBox
However, like Steff says - you really need to compile it yourself. Usually people who use Linux typically have a "DIY" attitude /technical background (although it's quite a bit more user friendly than in yesteryears!).
Anyway:
Search "How To Linux Trinity Core", I can't post the link as I'm new to Modcraft (well, haven't posted much).