Probably the docking station is the only technical reason blocking older devices, and Samsung doesn't want their customers running Linux on Galaxy without the d

Probably the docking station is the only technical reason blocking older devices, and Samsung doesn't want their customers running Linux on Galaxy without the docking station. You've got several choices for running a GNU/Linux container on Android/Linux already: Lil Debi for rooted devices, GNURoot for a full distro on non-rooted devices, and Termux for a quick-to-get-running and reliable CLI distro.