Just Debian\Termux with XFCE4 running on android.
edit: Sensors for battery/temperatures are not working properly rn
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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.