The game should work on Linux when using WINE:
https://www.winehq.org/

If you get an "Error Defining External Function", restart your computer. That usually works.

If it doesn't, or if you have any other questions, complaints, or comments, send an email to:
LeftFunk@gmail.com (Yes, with an L) Or post them on our subreddit: http://www.reddit.com/r/LegacyOfThePony