Linux is on your Chromebook, but not quite ready for the iTunes app.
If there is no dedicated option for updating, you can always open your Linux terminal and paste in: Step 4: Make sure your version of Linux is fully updated.
Make a special note of the username you pick, as this will be an important part of file paths later on. We know this may feel a bit tricky for some users, so we have a full guide on installing Linux on a Chromebook and everything you need to know - we highly suggest taking a look at it before moving on. Step 3: Select Turn On to install Linux, and follow the on-screen instructions. The most common Chromebook problems and how to fix them How to back up an iPhone using Mac, iCloud or PC