- Switch git clone from SSH to HTTPS for broader compatibility - Bail out if git clone fails before cd-ing into the repo - apt-get update + install zsh on Ubuntu - Install oh-my-zsh, powerlevel10k, zsh-autosuggestions, and zsh-syntax-highlighting if missing - Change default shell to zsh, registering it in /etc/shells if needed - Conditionally source .extra and add an .extra template