Installing Debian On The Turris Omnia Router
By default it runs OpenWRT, but Debian armhf userland can run on it, too. For now it though needs a non-vanilla (read non-debian) kernel as well as some binary blog.
Since this means that there is yet no Debian Installer support for the Turris Omnia either, the only known way to get Debian running on it is the omnia-debian project on GitHub. It's a script to cross-compile the kernel and to generate an image which with which you can flash Debian armhf on the Turris Omnia.