You have not chosen to trust “AddTrust External CA Root”, the issuer of the server’s security certificate.

After installing the latest Citrix Client on my Ubuntu 10.10 laptop I wanted to log in a a Citrix Portal.

I got the following error.

You have not chosen to trust "AddTrust External CA Root", the issuer of the server's security certificate.

This solved my problem:

sudo cp /usr/share/ca-certificates/mozilla/*.* /usr/lib/ICAClient/keystore/cacerts/

Posted in Linux and tagged , .


  1. I dont understand what does sudo cp /usr/share/ca-certificates/mozilla/*.* /usr/lib/ICAClient/keystore/cacerts/ mean??

  2. Thanks.
    For the newest Citrix it should be:
    cp /usr/share/ca-certificates/mozilla/*.* /opt/Citrix/ICAClient/keystore/cacerts/

  3. Citrix on Mint – remoting to the office via firefox on Mint 14 Nadia:

    Good general outline of installing citrix on ubuntu based systems:

    1) run: sudo apt-get install libmotif3 (other packages weren’t found, see above link)
    2) download citrix (deb package) and install:

    page link:
    actual package link:

    3) then copy certs from browser to citrix:
    cp /usr/share/ca-certificates/mozilla/*.* /opt/Citrix/ICAClient/keystore/cacerts/

    4) logout/logon

    5) open firefox and go to your office work from home url and follow usual logon process.


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