인터넷에 별별 삽질이 다 있는데 아래 이거 한방으로 끝.
It's a one line fix in /lib/systemd/system/gdm3.service
Replace
[Service]
ExecStartPre=/usr/share/gdm/generate-config
with
[Service]
ExecStartPre=/usr/bin/xinit /usr/share/gdm/generate-config
External monitor not detected on Ubuntu 18.04
After upgrading to Ubuntu 18.04, my laptop has been unable to detect/use an external monitor attached via HDMI. Even when plugged in, the "detect displays" button within the default settings app do...
askubuntu.com
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