How to install ffmpeg on Ubuntu 16?

Question

fmpeg

I went into the application manager, typed in "ffmpeg", installed it.
I went to the command line, typed "ffmpeg":
cannot locate the core snap: No such file or directory

I write: sudo snap install ffmpeg
I get: snap "ffmpeg" is already installed, see 'snap help refresh'

What do I not understand?

Answer 1

Try
sudo snap install core
If it doesn't help, then attach the result of the snap list