If you are running Ubuntu Server on your laptop, you may wish to disable Lid Switch.
sudo nano /etc/systemd/logind.conf
Look for #HandleLidSwitch=suspend and change according to your liking
HandleLidSwitch=poweroff to shutdown when lid is closed
HandleLidSwitch=hibernate to hibernate when lid is closed
HandleLidSwitch=ignore to do nothing
Restart systemd service or just reboot to apply changes
sudo restart systemd-logind