The newer versions of the Linux Citrix client do not always work due to a missing security certificate.
Here's the fix:
wget http://www.geotrust.com/resources/root_certificates/certificates/Equifax... && cp Equifax_Secure_Certificate_Authority_DER.cer /usr/lib/ICAClient/keystore/cacerts/Equifax_Secure_Certificate_Authority_DER.crt && exit
From: http://blandname.com/2008/11/10/you-have-not-chosen-to-trust-equifax-sec...
