If i install docker on the Cosmo it NMI reboots during the software installs. Not sure why guess it's a missing library I've followed the instructions from here selecting the arm64 build.
Unfortunately I can't capture the log files as i am unable to restart the debian image once it fails and have to flash the image back.
I have had this running on an ODRIOD before so i know it should work.
The ODROID was, I expect, running a Linux rather than an android kernel. The permissions on Android are essentially single user oriented and the root account isn't just trusted to be able to do anything.
If we can turn the Android off in the kernel and keep a functioning machine (I don't need more than wifi when in Linux mode) then we'll be able to use docker. There is no port I know of docker to Android which works.
This is what some people want, but it is useless to me. Termux is a more useful linux environment on Cosmo than Gemian is for me. Yes, Docker doesn't work but I don't expect it to and it isn't laggy or with widgets which fill the useful screen area.
Unfortunately I have a lot on at the moment and can't spend the time on this. I suspect that we may be close to being able to run a standard kernel on the old Gemini. That is probably where I will put my effort when I have time and keep this machine as a really decent Android.
