install Termux
optionally modify the configuration lines near the top of the script
download debian_on_termux_10.sh
(or debian_on_termux.sh
if using an Android version before 10) and run it;
wget -q https://raw.githubusercontent.com/sp4rkie/debian-on-termux/master/debian_on_termux_10.sh && sh debian_on_termux_10.sh
Debian will be installed only if it is not already.
you will be proot-ed to Debian, type exit to return to termux.
Without a pull request are not likely to be addressed.