如何解決無法連入ubuntu vnc server

使用Ubuntu預設的vnc server（vino），卻發現除了也用Ubuntu預設的vnc client（Remmina）可以成功連到外，OS X、iPhone、android、Chrome等出現像下面那樣的錯誤訊息：

Chrome(RealVNC): The authentication mechanism requested cannot be provided by the computer.

OS X: The software on the remote computer appears to be incompatible with this version of Screen Sharing. 

RealVNC: Unable to connect to VNC Server using your chosen security setting. Either upgrade VNC Server to a more recent version from RealVNC, or select a weaker level of encryption.

Android(Jump): The VNC server is not configured to use a compatible security type. Please make sure the VNC servers to configured to accept VNC authentication.

iOS(Remoter VNC): Unknow authentication scheme from VNC server: 18

Solution: 這些問題，用下面一行指令就可以解決：

gsettings set org.gnome.Vino require-encryption false

建議大家可以使用ssh作為加密通道，這樣就能安全地使用VNC。