I am setting up the Unity Editor on CentOS using Docker. I am using the Unity 5.5.1xf1Linux Linux Editor shell script to install. After deciphering the dependencies I have managed to get it installed. So far things seem to be going OK but when I follow the instructions to pass the serial, username and password as per: https://docs.unity3d.com/Manual/CommandLineArguments.html I recieve the error: [0628/123155:ERROR:browser_main_loop.cc(161)] Running without the SUID sandbox! See https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment for more information on developing with the sandbox on. all/unity-editor-5.5.1xf1Linux/Editor/Data/Mono/lib/mono/2.0' Mono path = '/unityinstall/unity-editor-5.5.1xf1Linux/Editor/Data/UnityScript' Mono path = '/unityinstall/unity-editor-5.5.1xf1Linux/Editor/Data/Mono/lib/mono/2.0' Mono config path = '/unityinstall/unity-editor-5.5.1xf1Linux/Editor/Data/Mono/etc' Using monoOptions --debugger-agent=transport=dt_socket,embedding=1,defer=y,address=0.0.0.0:56177 DisplayProgressbar: Unity license Cancelling DisplayDialog: Failed to activate/update license. Timeout occured while trying to update license. Please try again later or contact firstname.lastname@example.org This should not be called in batch mode. (Filename: /home/builduser/buildslave/unity/build/Editor/Platform/Linux/EditorUtility.cpp Line: 222) I see there is a similar issue open here: https://forum.unity3d.com/threads/5-4-0p1-fails-to-launch-due-to-license.425277/ However there seems to be no clear resolution. Any advice would be great, happy to provide any additional information to help clarify.