System diagnostic suddenly gives me: Found invalid certificate '/etc/univention/letsencrypt/signed_chain.crt'

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Certificate store is /etc/ca-certificates.conf and comment out with an ! in front like this:

!mozilla/DST_Root_CA_X3.crt

Then save and then run update_ca_certificates

And then restart affected services (apache, dovecot, whatever) using the cert.

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