cURL Error with Let's Encrypt Certificate

Hello everyone,

I created a VM with Ubuntu 16.04.3 and installed Apache2.4 on it.
My Nextcloud instance is working fine but I want to use the Collabora too.
So I used the tutorial from nextcloud and installed the docker container.

My Apache is running “cloud,” and “” with Let’s Encrypt Certificates.
I googled so much and tried to eleminate the error but cant fix it.

This is the error message I get when I tried to open an doc file:

Error richdocuments GuzzleHttp\Exception\RequestException: cURL error 60: SSL certificate problem: unable to get local issuer certificate

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