I have Apache Guacamole set up at Linode. When I try to access 5 users at once I get an generic error that something went wrong. Can you tell me which folder contains the error log files?
Just to be sure, have you installed Guacamole via Cloudron on Linode or directly on the server? Asking since this is a Cloudron related forum. On Cloudron you can see the app logs via the logviewer from the dashboard.
On Cloudron, use https://docs.cloudron.io/apps/#log-viewer