Alternate Linux distribution. This is not Android/Magisk root.
How-to
How to
Boot and install the Linux image named in the sources (postmarketOS / Armbian / Ubuntu Touch) from USB or SD per the source pages; check firmware/boot settings first.
Follow the specialist sources linked on this page. If this path is a jailbreak, unlock, or flash, the specialist wiki is the how-to — we do not copy those steps here.