Linux users will need to download the Citrix Receiver from the Citrix website . . .
Open a browser, and navigate to https://www.citrix.com/downloads/citrix-receiver/, and locate the link for 'Receiver for Linux' which should look something like this:
For the Debian package, once it's downloaded, the browser asks if we'd like to open it with the 'Software Install'. Agree to this by clicking 'OK', and in the following window, click the 'Install' button.
You may need to authenticate with administrative credentials.