SSL error launching Citrix Workspace


I need to see if anyone knows how to trust a digicert certificate. I am having trouble launching Citrix hosted apps through the Workspace app. I just installed the current citrix workspace app for Ubuntu, but this certificate error still keeps popping up. thank you in advance.

Referencing this... open a Terminal an enter...

cd /opt/Citrix/ICAClient/keystore/cacerts
sudo wget https://cacerts.digicert.com/DigiCertGlobalRootG2.crt