Yes, follow the experts instructions
a. Open
www.minetest.netb. Click on the Download tab on top of the page
c. Click on daily/unstable --> Ubuntu/Mint
d. You're now on the "Minetest Developers" team page. Click on (Read about installing) and follow the steps.
e. Open an extra window to display the "Technical details about this PPA" to copy it :-)
1. I think, looking at it, that this is another Minetest compiler than the one of Captain Trips. I've not enough knowledge to advice you in this. I only know that installing through this site made it work for me.
2. I did it like this the first time, but made a mistake with the signing key I think (copied probably the whole line :-/ ), probably causing the update problems.
3. I searched minetest in the synaptic package manager (SPM), clicked the square and then pushed apply. A minetest icon appeared under games and I could play.
With my present experience, I personally prefer my earlier adviced method. Go to
www.minetest.net , click the Github tab (instead of the download button), scroll down until the readme.txt and follow the instructions under "Compiling on GNU/Linux" You then compile it yourself, directly from the source offered you by celeron55. The "disadvantage" here is that you regularly have to compile yourself if you want the latest version, instead of clicking a square in SPM
Either way, it's worthwile to install 0.4. I wish you the best of luck installing it (without making too much typo's)!