Question: how to install lmms on ubuntu 16.04?
Answer: Search for a thing called the "terminal" and write down "su" if you are operating on Debian, or "sudo" for Ubuntu. ( ... 
Then, write down your admin password.
Write this: (CTRL-C + SHIFT-CTRL-V in terminal) ... 
Press "y" if required by terminal.
Give the terminal some time to finish and then close it.