安装
sudo apt-get install xserver-xorg-core-hwe-18.04
sudo apt-get install xserver-xorg-video-dummy添加配置文件，实现开机自启动
在 /usr/share/X11/xorg.conf.d/ 中添加 xorg.conf 文件如下：
sudo vim /usr/share/X11/xorg.conf.d/xorg.conf内容如下：
Section "Monitor"
Identifier "Monitor0"
HorizSync 28.0-80.0
VertRefresh 48.0-75.0
# https://arachnoid.com/modelines/
# 1920x1080 @ 60.00 Hz (GTF) hsync: 67.08 kHz; pclk: 172.80 MHz
Modeline "1920x1080_60.00" 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync
EndSection
Section "Device"
Identifier "Card0"
Driver "dummy"
VideoRam 256000
EndSection
Section "Screen"
DefaultDepth 24
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Depth 24
Modes "1920x1080_60.00"
EndSubSection
EndSection保存好以后重启
sudo reboot