問題描述：希望ubuntu下電腦能夠在合蓋或者點選掛起時電腦是休眠狀態，而不是直接關機，帶來很多不便。通過自己查詢的一些資料，發現以下辦法基本上可以解決我的問題，希望能夠對大家有幫助。
方法一：

方法一：
To make Ubuntu do nothing when laptop lid is closed:
1、Open the /etc/systemd/logind.conf file in a text editor as root, for example,
sudo -H gedit /etc/systemd/logind.conf

2、Add a line HandleLidSwitch=ignore (make sure it's not commented out!),
3、Restart the systemd daemon with this command:
sudo restart systemd-logind

or, from 15.04 onwards:
sudo service systemd-logind restart
 

方法二：

You can easily do it.
Edit /etc/systemd/logind.conf and set
HandleLidSwitch=hibernate
HandleSuspendKey=hibernate

You can also use hybrid-sleep instead of hibernate.
Don't forget to remove the # in front of the above two lines and also to reboot.