echo "deb http://deb.volian.org/volian/ scar main" | sudo tee /etc/apt/sources.list.d/volian-archive-scar-unstable.list
wget -qO - https://deb.volian.org/volian/scar.key | sudo tee /etc/apt/trusted.gpg.d/volian-archive-scar-unstable.gpg > /dev/null
sudo apt update && sudo apt install nala
 

sudo nala upgrade

Documentation

https://gitlab.com/volian/nala