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A dummy driver can help!
Just following the first voted answer here https://askubuntu.com/questions/453109/add-fake-display-when-no-monitor-is-plugged-in.
It works for me in Ubuntu 16.04 with a little modification:
sudo apt install xserver-xorg-video-dummy-lts-xenial
./usr/share/X11/xorg.conf.d/xorg.conf
following the above link.Section "Device" Identifier "Configured Video Device" Driver "dummy" EndSection Section "Monitor" Identifier "Configured Monitor" HorizSync 31.5-48.5 VertRefresh 50-70 EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" DefaultDepth 24 SubSection "Display" Depth 24 Modes "1024x800" EndSubSection EndSection