Certificates

Add CA to linux

cp cert.crt /usr/local/share/ca-certificates/
update-ca-certificates

If result

Updating certificates in /etc/ssl/certs...
rehash: warning: skipping ca-certificates.crt,it does not contain exactly one certificate or CRL
1 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.

Good Job, else check cert format (crt) or something