If you run into the following error when installing FFmpeg on Ubuntu
Package ffmpeg is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package ‘ffmpeg’ has no installation candidate
You can do the following to install FFmpeg instead:
sudo add-apt-repository ppa:jon-severinsson/ffmpeg
sudo apt-get update
sudo apt-get install ffmpeg
The PPA above is maintained here:
https://launchpad.net/~jon-severinsson/+archive/ffmpeg
And is referenced by the main FFMPEG page here
http://ffmpeg.org/download.html#LinuxBuilds