I originally posted this in the installing and upgrade forum because I was installing Moodle when I did it, but I see it doesn't belong there now!
I've been trying to configure CAS for SSO. I've configured it (badly, I guess...) and disabled all auth plugins except manual accounts and CAS. I now get "Error: Internal script failure" on the login page. I can't access anything but the emptyand this error.
I've followed the instructions here and here and still can't find any useful logs anywhere, so I can't see a way to tell what the actual issue is. I've had a look through the database but can't find how I would change which auth plugins are enabled. There's another forum post somewhere about a similar issue, but the resolution seemed to involve logging in.... which I can't do.
This is a fresh installation of Moodle 3.9.2 (2020061502.07) running on Ubuntu server 20.04.1 LTS.