Webstore, CITRIX Workspace on UBUNTU Certificate error

Receive this error when trying to use CITRIX Workspace on an Ubuntu Linux Box, "Your account cannot be added using this server address. Make sure you entered it correctly. An SSL connection to the server couldn't be established because the server's certificate was not trusted."

Problem

User receives the error "Your account cannot be added using this server address. Make sure you entered it correctly. An SSL connection to the server couldn't be established because the server's certificate was not trusted."

Solution

Follow the section "Installing root certificates on user devices" on this page: https://docs.citrix.com/en-us/receiver/linus/current-release/secure.html.