there is lots of tutorial how to share dekstop screen on linux that never work for me
like :
serviio share desktop
share desktop using airplay with airplay.jar in instracttables
share desktop using vlc desktop streaming
mirror deskop using chromecast extentions
After lots of tires and fail to share linux desktop screen to ezcast connection to video projector
if found there is ezcast chrome extention that has mirror desktop ability