-e: the icon for the executable is missing and a "?" is displayed instead
--workaround: set a default icon yourself in player settings

-repro:
--create new empty project
--make linux build
--run build
--NOTICE no icon set but a "?" is shown instead
---Gtk-WARNING **: Error loading icon from file '/home/stefan/Downloads/2017.1/2017.1b6_cubecam_Data/Resources/UnityPlayer.png':
Failed to open file '/home/stefan/Downloads/2017.1/2017.1b6_cubecam_Data/Resources/UnityPlayer.png': No such file or directory