Just Debian\Termux with XFCE4 running on android.
edit: Sensors for battery/temperatures are not working properly rn
XFCE really is it isn’t it? I first tried it when I got my CDs in the mail for Mandrake/Mandriva Linux back in 2002 or so and am still using it today!
Hoping for Wayland support soon
Nooo Wayland, it doesn’t work on android…it’s gonna break my emergency workstation xD
Tbh, I wanted to install gnome3, 'cause well…it’s basically a mobile desktop, the interface is very touch friendly. But it doesn’t work cause Wayland, and it would probably be a lot heavier to run.
How?
You can install Termux from the F-droid store, which is a Android terminal emulator and Linux environment. Then install the proot-distro package and you can install stuff like Ubuntu, Debian, Arch…
you dont even need a rooted device.
As OP said, you use Termux. You can use AnLinux or Andronix for easier setup with Termux. You will likely also need a VNC Viewer to actually see and use the desktop. It’s been a while, so I don’t recall exactly how to do it, sorry.