convert *.aif file | 16.04

I have a series of *.aif / Mac audio files that I would like to put into an Ubuntu friendly format.
Ideally I would like a no-fuss / virtual no-brainer solution.

http://askubuntu.com/questions/28653...o-files-to-mp3
This looked promising, but I tried installing a couple and did not succeed.
Most notably,
FF-Multi Converter: which seemed to be the best bet with clear install commands
…....
E: Package 'ffmulticonverter' has no installation candidate.

As I do not use Linux much these days, I am wondering if the above links have grown old, or if I am missing something, or if my woes spring from a new release bug of some sort.

Any solutions, especially simplistic ones, will be appreciated.