Ok - it should work to install the Internet Archive Server with …
curl -o/tmp/install.sh -L https://unpkg.com/@internetarchive/dweb-mirror/rachel/install.sh
chmod +x /tmp/install.sh
sudo /tmp/install.sh
With more detailed instructions at https://github.com/internetarchive/dweb-mirror/blob/master/INSTALLATION-rachel-rpi.md
I couldnt do the ideal one-line installer such as
curl -L https://unpkg.com/@internetarchive/dweb-mirror/rachel/install.sh | bash
because apt upgrade goes full-screen when it tries to upgrade Kolibri and sticks, otherwise I think it would work.