Few days ago I have trouble in sleeping, then i have idea what if I turn the music on so I can fell a  sleep soon, a moment later  questions arise "who  would turn off my laptop, when I was sleeping ?", quickly I look for the  solution..
we can use linux basic commands to  perform automatic system shutdown in ubuntu or even to switch the system on again.  here is the command what i mean:
shutdown -h <desire time> 
The command above can be use in two  ways, that is:
 Automatic system  shutdown (halt) using exact hour and minute/hh:mm.
example: shutdown -h 21:00the command above will make system automatically shutdown a the time 09:00 PM
Automatic system shutdown (halt) a  few minutes after command executed  
example: shutdown -h +60
if explanation above isn't clear, Here is some example   step by step how to make automatic shutdown (halt) in ubuntu by the time 11:00  PM
- Open terminal, Applications > Accessories > terminal (or press Ctrl + Alt + T )
 - Go to #root mode ( type 'su' in your terminal then enter your #root password)
 - Type this command to your terminal
 
shutdown -h 23:00
- ENTER
 
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