CITRIX FIX-SSL-61-Error on Browser ( Firefox), works for MintLinux and OpenSuse Tumbleweed...:
 

This Site Actually had the solution, just to copy .crt files...: ( and for OpenSuse, just to copy the .pem files... )
https://ask.fedoraproject.org/en/que...x-application/
Thank you for this answer. It worked for me. I only needed one certificate, and I was able to get it and copy it to /opt/Citrix/ICAClient/keystore/cacerts/ with this method. And it works.
passthejoe (Aug 25 '15)

I did the following...: ( RT) ... 05/18/2017...:
SomeDude@SillyServer-40-Four /usr/share/ca-certificates/mozilla $ sudo cp *.crt /opt/Citrix/ICAClient/keystore/cacerts/
[sudo] password for SomeDude:
SomeDude@SillyServer-40-Four /usr/share/ca-certificates/mozilla $


I did the following on 09/22/2018 in OpenSuse Leap 4.2 Plasma Version to fix an error-61 while accesing Citrix ...:
SomeDude@linux-0epn:/etc/ssl/certs> pwd
/etc/ssl/certs
SomeDude@linux-0epn:/etc/ssl/certs> sudo cp *.pem /opt/Citrix/ICAClient/keystore/cacerts/
[sudo] password for root:
SomeDude@linux-0epn:/etc/ssl/certs>