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Ubuntu Server seems to be not working if the screen is not plugged in

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My device is Lenovo ThinkCentre M910q I have installed the latest Ubuntu Server 22.04.2

I had to add a ‘nomodeset’ flag to the grub menu when I booted to USB Installer and after the installation was completed to let the screen not be black.

Everything was OK if I plugged my screen in via Displayport, I could also access the SSH via LAN but when I plugged out my screen, then turned it on and waited for a while, I can’t access the SSH via LAN, I scanned the network but it was not available.

I have tried to fix as below but it’s not working :(

Uncomment GRUB_TERMINAL=console in /etc/default/grub

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