Ubuntu desktop freeze on login if headless

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    Client Windows 7 ultimate, NoMachine 5.1.62_1.

    Server Ubuntu Linux 14.04 NoMachine 5.1.62_1, kubuntu desktop.

    The Linux server is headless (no monitor, keyboard or mouse).

    I can type password and see the desktop displayed with icons on the left. The desktop freezes before the GUI is fully displayed, e.g. the icons & buttons normally seen at the top-right of the screen are not displayed. I can move the mouse cursor around, but otherwise the Linux desktop is completely unresponsive.

    If I attach monitor, keyboard and mouse then it works ok.

    Thanks in advance for any help.




    This probably occurs because when no monitor is attached no rendering actually happens (graphics card is “turned off”). You can try to stop the X server as suggested here: https://www.nomachine.com/forums/topic/ubuntu-16-04-headless-resolution-stuck-1024×768#post-11035. NoMachine will then create his own virtual display.

    Alternatively you can use a display emulator dongle.

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