Which operating system did you install it on?
Did you configure anything so far? (for example changed any ports or added any neighbors so far?)
By the way this reminds me of something similar I have opened an issue a while back https://github.com/iotaledger/iri/issues/1678
Maybe you've added a neighbor with an invalid port? Please check /etc/default/iri
As stated in the instructions, you should run the installation as root by becoming root (sudo su), else it doesn't get the correct ENVs for root.
The correct link for the most up-to-date documentation is https://iri-playbook.readthedocs.io/en/feat-docker/getting-started-quickly.html
Note that the command only has one <, i.e.:
bash <(curl -s https://...