We have a section in our documentation that explains how to generate and install the Let's Encrypt certificates in our stacks, were you following it?
As you can see, our guide shows the full path to the ctlscript.sh file. That file is inside the root installation folder. If you have any other problem when running the ctlscript.sh command, we have a Support Tool that will gather relevant information for us to debug the issue. Could you please download and execute it on the machine where the stack is running by following the steps described in the guide below?
How to Run the Bitnami Support Tool
Please note that you need to paste the code outputted by the tool in your reply.
We will also need the output of the following command:
sudo ls -la /opt/bitnami/