Installed on stock Kindle no root (v1.8.7)

[buzzkillb]

Sideload Google Play Store. Install termux and hackers keyboard from google play store. Going to try the direct nodesource way next.
https://github.com/buzzkillb/termux-ubuntu

Inside of termux

pkg install wget proot
mkdir -p ~/jails/ubuntu
cd ~/jails/ubuntu
wget https://raw.githubusercontent.com/buzzkillb/termux-ubuntu/master/ubuntu.sh
bash ubuntu.sh
./start-ubuntu.sh

once in ubuntu in termux, I think sudo doesn't work once in here

apt install -y curl git
curl -sL https://deb.nodesource.com/setup_12.x | bash -
apt-get install -y nodejs
git clone https://github.com/carsenk/kronos.git
cd kronos
npm install
npm run headless