1. 가상 모니터 드라이버 설치sudo apt-get install xserver-xorg-video-dummy2. xorg.conf 파일 생성sudo nano /etc/X11/xorg.conf3. 내용 넣기Section "Device" Identifier "Configured Video Device" Driver "dummy"EndSectionSection "Monitor" Identifier "Configured Monitor" HorizSync 31.5-48.5 VertRefresh 50-70EndSectionSection "Screen" Identifier "Default Screen" Monitor "Configured Monitor" ..