Ubuntu Linux and Apple iPod
This will depend on if it is an OLDER IPOD or a NEWER IPOD.
https://www.slant.co/topics/4316/versus/~clementine_vs_strawberry-music-player_vs_spotify
using gtkpod
Linux Journal
Chapter 16: Ubuntu and Your iPod - HowTo
Install: gtkpod
apt install gtkpod
using Rhythmbox
Rhythmbox is also supposed to work with the iPod
Launch Rhythmbox. Find it in Applications > Sound and Video > Rhythmbox Music Player. Step Two
Connect your iPhone via USB. It will appear under Devices.
Click Music in your computer’s library. Browse for songs to add to your iPhone. Sync them to your iPhone by Dragging and Dropping onto your iPhone’s icon under devices.
using Amarok Music Player
Amarok is not in Ubuntu 19.4 because it was a Qt 4 application and for that reason it was removed from Ubuntu. All applications that do not use the Qt 5 toolkit are also being removed from Ubuntu (and Debian).
Clementine
just type
apt install clementine
Clementine lets you transfer your favorite songs to your iPhone or iPod just like you did on iTunes.
Only works with iPod Classic or Shuffle - not with Touch nor iPhones