노트북 덮혀도 시스템 유지하기

http://askubuntu.com/questions/360615/ubuntu-server-13-10-now-goes-to-sleep-when-closing-laptop-lid

I've had the same problem and after a lot of reading, I realized that Ubuntu 13.10 uses systemd-logind and it handles the lid close event. To disable entering the sleep mode edit the /etc/systemd/logind.conf file and uncomment/modify/add the line:

HandleLidSwitch=ignore

Then execute sudo restart systemd-logind or simply reboot.

This has solved the problem on my PC.

Update for 15.04

I'm not sure if Ubuntu 15.04 already switched to systemd completely. If so, the new command for restarting the service is sudo systemctl restart systemd-logind.service.