Run startup.sh as a startup script, or run curl -L oru.to/install | sudo bash.
This is mainly for other people willing to use JJ1LFC's environment. Replace __username__ to the string you want to set as a username.
curl -L oru.to/install | sed -e 's|alt|__username__|g' | sudo bash
After using this, the login shell is set to be zsh (/usr/bin/zsh). If fish is preferable, do:
sudo apt-add-repository ppa:fish-shell/release-3
sudo apt-get update
sudo apt-get install fish
chsh -s $(which fish)