Error installing

I'm trying to install the software on a brand-new configured Raspberry Pi 4 with:

curl \
  --silent \
  --show-error \
  https://raw.githubusercontent.com/tiny-pilot/tinypilot/master/get-tinypilot.sh | \
    bash - && \
  sudo reboot

...but I get the following at the end:

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 janus:armhf : Depends: libduktape205:armhf (>= 2.0.3) but it is not installable
               Depends: libusrsctp1:armhf (>= 0.9.3.0+20190901) but it is not installable
               Depends: libwebsockets16:armhf (>= 4.0.19) but it is not installable
               Recommends: lua-ansicolors:armhf but it is not installable
               Recommends: lua-json:armhf but it is not installable
               Recommends: ssl-cert:armhf
 tinypilot:armhf : Depends: python3:armhf but it is not going to be installed
                   Depends: python3-pip:armhf but it is not installable
                   Depends: python3-venv:armhf but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
+ clean_up
+ sudo umount --lazy /mnt/tinypilot-installer
+ sudo rm -rf /opt/tinypilot-updater /mnt/tinypilot-installer

What did I do wrong?