I wonder how that would work out :-)
What you must do is (and it looks more work than it really is (ony 5-10 minutes):
1) go to the C55-Github site:
https://github.com/celeron55/minetest2) Scroll down to the readme.txt
3) Scroll down in the readme.txt a bit more till you see:
Compiling on GNU/Linux:
-----------------------4) Now open your terminal, you'll see something ending with
~$5) Type the word sudo in your terminal after
$. Don't push the enter/return key yet!.
6) Copy the whole line: apt-get install build-essential libirrlicht-dev ... till ... libopenal-dev
7) Paste that line behind sudo and now push enter/return.
8) Ubuntu will ask your password for the computer. Fill it in and hit enter/return. The libraries you need for minetest are now getting installed. Probably you already have them, but that's no problem.
8) Then copy the line after
$ (the whole line except the $)
9) Paste it in your terminal after
$10a) Repeat 8 and 9 till you want to copy this:
cd celeron55-minetest-286edd4 (or similar). Only copy the green part in your terminal. Do not enter/return yet.
10b) Open your file manager programme on your computer. In your homefolder you will see
celeron55-minetest- with another code than
286edd4 (or similar). Type that code directly behind
cd celeron55-minetest-. Now you can enter/return
11) Repeat 8 and 9 until you have copy/pasted
make -j2. This last one will take the most time.
12) You don't need to do cd bin, because you can use your file manager from here on to go to your bin.
You've now compiled and installed the latest minetest version on your Linux.
MODS
1) Look in the "mod releases or modding general" on the forum for whatever mod you like. The first post of each mod normally contains a
link to ompldr, dropbox, github, etc. (thanks Vanessa :-) ). Further the author most of the times puts some screenshots, a description and the crafting recipes for that mod. I advice you to download "moreblocks" to try the 1st time.
2) Click the link to download the mod in your download folder.
3) Go to your download folder and doubleclick the mod file.
4) Select the folder (moreblocks) by clicking on it.
5) Select the word "extract" and click on it
6) Browse in this screen to your select your home/..../celeron-..../mods/minetest folder
7) Now click on "extract" (right-under), so the mod will be extracted and put in your mods/minetest folder
8) you can close or quit the extract application.
This all should work, but just ask if something gives you trouble. If a mod doesn't seem to work, ask in that mod's topic on the forum your question.