"SSL error
Contact your help desk with the folling information:
You have not chosen to trust "DigiCert High Assurance EV Root CA",
the issuer of the server's security certificate (SSL error 61)"
Whaatttt!! Are you serious! How stupid. So if I go to https://www.digicert.com/digicert-root-certificates.htm I can test my certificates and they work just fine for the DigiCert High Assurance check, so that means the browser knows where they are but the stupid Citrix app doesn't. So all of the certs are located here in Ubuntu (you have a ton in there):
ls /etc/ssl/certs/ | grep DigiCert
You will see the one you want, now copy it to your Citrix folder:
sudo cp -v /etc/ssl/certs/DigiCert_High_Assurance_EV_Root_CA.pem ~/./ICAClient/linuxx86/keystore/cacerts/
Now try again and it will work, I didn't even have to restart my browser. You could also do a symbolic link instead which is maybe a better practice.