Ubuntu client reports an untrusted let's encrypt certificate

On my Ubuntu 20 LTS desktop with the latest nextcloud client I get a warning when I start the client indicating that the certificate is invalid. If I connect to the nextcloud site via the browers (Firefox), everything looks ok as far as the certificate is concerned.

@poldi welcome to the forums and thanks for your first contribution.

I’m afraid your thread doesn’t meet any request for neccessary informations… you’d need to give out way more than literally none

Ubuntu version is 20 LTS Desktop
The client is per screenshot

The error I get is

if I connect to nextcloud via Firefox the cert looks like this

Please let me know what other info you need.

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