There's no official install package, but you can clone the Git repository and compile it pretty easily. See the developer wiki articles on
GitHub,
Git, and
Compiling Minetest. I agree it would be more ideal to have an official install package, but at least if you are a motivated Linux user there's still an option. I have actually created an Ubuntu install package for my own personal use, but I'm not really up to doing package maintenance for others at this point.