Installing a root/CA Certificate and sloved Citrix SSL 61 Error

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Given a CA certificate file certificate.crt, follow these steps to install it on Ubuntu:

  1. Create a directory for extra CA certificates in /usr/share/ca-certificates:
    sudo mkdir /usr/share/ca-certificates/extra
    
  2. Copy the CA .crt file to this directory:
    sudo cp certificate.crt /usr/share/ca-certificates/extra/certificate.crt
    
  3. Let Ubuntu add the .crt file’s path relative to /usr/share/ca-certificates to /etc/ca-certificates.conf:
    sudo dpkg-reconfigure ca-certificates
    

In case of a .pem file on Ubuntu, it must first be converted to a .crt file:

openssl x509 -in certificate.pem -inform PEM -out certificate.crt

For Citrix Reciever:
sudo ln -s /usr/share/ca-certificates/mozilla/* /opt/Citrix/ICAClient/keystore/cacerts