That's actually how I got started with Android, running a full Debian off an ext4 partition of which I had to compile the module, I went the route of 'setprop ctl.stop zygote and media' and ran on the FB, it ran surprisingly well, a slight bug in the MSM FB driver with color formatting though that I found and fixed. ( I think it was my first post on XDA actually, https://forum.xda-developers.com/t/howto-install-gnu-linux-o... ) pictures are now gone but I have the web server archived somewhere so maybe one day. But i got to use and maintain a lot of my Linux knowhow I'd not really maintained because of life, 12 years later and I'm still messing with Android phones. New and old. On f-droid there is AnLinux (Run Linux On Android Without Root Access) https://f-droid.org/packages/exa.lnx.a/ that straps around Termux, and using xsdl-xserver (sourceforge) you have a pretty decent desktop, using a usb/hdmi/vga adapter and all is well.