sudo gedit /etc/default/grub
change : GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to : GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi=force"
sudo update-grub
sudo gedit /etc/default/grub
change : GRUB_CMDLINE_ LINUX_DEFAULT= "quiet splash"
to : GRUB_CMDLINE_ LINUX_DEFAULT= "quiet acpi=force"
sudo update-grub