https://github.com/koreader/koreader/issues/4398 koreader can run on X11 with Debian/Ubuntu...
And There are some tutorials on this forum for running Debian on Kindle/Kobo.
This is my awesomewm configuration file optimized for Kindle:
https://github.com/zaoqi-unsafe/AwesomeTouch
temporarily, I don't have time to develop it