I've been trying to sync music to my Black iPod Nano 4th Generation (Model MB754) with Ubuntu 14.04 64-bit. I've tried using Clementine and Rhythmbox to add music. The music syncs fine and appears in my iPod's music library, but when selecting the music, the iPod displays the track, but doesn't play and gets stuck at 0:00. It correctly displays the length of the song and other information (except Album Art, which I guess is an option I have to set).
It seems to be a format issue, but I'm not sure. I've set Clementine to convert the music to MP3 before syncing.
What could the problem be?