sudo ln -s /usr/share/ca-certificates/mozilla/* /opt/Citrix/ICAClient/keystore/cacerts
Alternativ habe ich auch schon diese Anleitung von Citrix selbst benutzt, um einzelne Zertifikate manuell zu installieren:
Download CA certificate in PEM format. Save the certificate with .crt file extension. Switch to root user and copy the .crt CA certificate file to /opt/Citrix/ICAClient/keystore/cacerts/ folder. Make sure the CA certificate file is owned by Root user and Group, and it has -rw-r--r-- or 644 as the File permissions. Run /opt/Citrix/ICAClient/util/ctx_rehash
Note: Location of /opt/Citrix/ICAClient/keystore/cacerts/ and /opt/Citrix/ICAClient/util/ctx_rehash may vary depending on the distribution and location you would be installing Citrix Worskpace App for Linux. Above location is on default Ubuntu Distribution installation directory /opt/Citrix/ICAClient/