Citrix Receiver on Linux
“Citrix is a service that enables the use of Windows applications from a variety of platforms without needing to install the application locally. The application’s computing and GPU needs are handled by EWS-hosted servers.” 
— Engineering IT
If you go to the IT page for setting up Citrix, you will notice that a certain OS is missing… Linux for NOT EWS.
The following are instructions Patrick got from IT about how the EWS Linux boxes were set up. These were tested on *ubuntu systems, YMMV.
  - follow steps 1-3 of IT’s instructions for Mac (obviously the Linux program will look different).
- At this point you will get an SSL error. Here starts the fun.
- Open https://citrix.engr.illinois.edu/ in your web browser, and figure out how to download the Certificates. 
  - In Chrome, this is achieved by opening Developer Tools and clicking on the Security tab, then “View Certificate”.
- In Firefox (TODO)
 

There should be three certificates, e.g. as shown in the screenshot from Chrome: 
 
Save these files however you like, but for the purposes of this tutorial we will do the following:
  - citrix.engr.illinois.edu –> citrixengrillinoisedu.pem
- InCommon RSA Server CA –> citrixInCommonRSAServerCA.pem
- TokenUSERTrust RSA Certification Authority 
 –> citrixUSERTrustRSACertificationAuthority.pem
  - b3c7a5f0.0 -> citrixengrillinoisedu.pem
- b4261fc2.0 -> citrixInCommonRSAServerCA.pem
- fc5a8f99.0 -> citrixUSERTrustRSACertificationAuthority.pem
