Upgrading Crostini to Debian Buster (10)
The Chromium team is hard at work with bringing new features to Chromebooks, recently a change was made to set Debian 10 (Buster) as the default operating system for the Crostini “Penguin” container. Unfortunately this change does not upgrade existing installations of from Debian 9 (Stretch) to Debian 10. You are in luck though as upgrading your existing container is pretty easy, here are the steps.