The idea is to support Linux desktops like Ubuntu and Fedora. Currently, only the web client is available for Linux, but many features are not available.
I use AVD for work and the current Linux offering is not anywhere close to Microsoft's remote client for Windows. As others have pointed out, you offer this client for every OS except Linux. I am not the only professional who has need of this and I'm sure we would all be eternally grateful if a Linux client were developed.