how to fix cpu shutdown problem in ubuntu

Question : why CPU not Shutdown in ubuntu ? 

[1]. Open Terminal & Type Code: ( sudo -i) & ↵

[2]. when ask Password ( Type User Password) & ↵

[3]. Type Code: ( gedit /etc/default/grub) & ↵

[4]. Now you will see a file name gedit popup open

[5]. Find the line Code: ( GRUB_CMDLINE_LINUX_DEFAULT="quiet splash")

[6]. Now Change this line to: ( GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force")

[7]. Now Save the file and Close it.

[8]. Now come back to runing Terminal

[9]. Now Type Code: ( update-grub) & ↵

It's Done Enjoy
Note : if you are using cairo-dock please Removing Cairo-dock from the startup applications and try to shutdown from top panel.

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OR TRY ALTERNATIVE CODE IN TERMINAL

For Shutdown : ( sudo shutdown -h now) & ↵
OR
( sudo /sbin/shutdown -h now) & ↵

For Restart : ( sudo shutdown -r now) & ↵
OR
( sudo /sbin/shutdown -r now) & ↵

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