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
怪我咯2017-04-17 12:05:21
http://askubuntu.com/questions/432542/is-ffmpeg-missing-from-the-official-repositories-in-14-04
