Turn of laptop display in ubuntu server:
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Can turn of the display automatically after by editing the grub configure file so screen is not all ways running on laptop that is currently a server.

1.
sudo nano /etc/default/grub

2.
Add this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet consoleblank=60"

Save using Ctrl^X


3. Then:
sudo update-grub

4. and reboot!


Source: https://askubuntu.com/questions/62858/turn-off-monitor-using-command-line
Date: November 2022