What is this?

A simple ubuntu package for MultiMC that wraps the contains a script that downloads and installs real MultiMC on ubuntu based systems.

It contains a .desktop file, an icon, and a simple script that does the heavy lifting.

How to build this?

You need dpkg utils. Rename the multimc folder to multimc_1.3-1 and then run:

fakeroot dpkg-deb --build multimc_1.3-1

Replace the version with whatever is appropriate.