Download
wget https://vcenter.myserver.net/certs/download.zip --no-check-certificate
Unzip
unzip -D download.zip
Archive: download.zip
inflating: certs/lin/e3fb3d19.r1
inflating: certs/mac/e3fb3d19.r1
inflating: certs/win/e3fb3d19.r1.crl
inflating: certs/lin/e3fb3d19.0
inflating: certs/mac/e3fb3d19.0
inflating: certs/win/e3fb3d19.0.crt
Rename certificate
mv certs/lin/e3fb3d19.0 certs/lin/e3fb3d19.crt
Copy the renamed certificate
sudo cp certs/lin/e3fb3d19.crt /usr/local/share/ca-certificates/.
Update certificates
sudo update-ca-certificates
Updating certificates in /etc/ssl/certs...
1 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.