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I'm using ubuntu 14.04 and I'm not able to shut down or reboot my laptop. After pressing the reboot/shutdown button it just shows the purple screen & 5 dots. I'm not able to understand where the problem is.

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  • So can you turn it on?
    – Tim
    Jul 2, 2014 at 18:12
  • yeah there is no issue in turning on the system
    – user299731
    Jul 2, 2014 at 18:14
  • 1
    What do you get when you execute sudo poweroff and sudo reboot on a terminal?
    – jobin
    Jul 2, 2014 at 18:18
  • Or sudo shutdown -P now
    – Tim
    Jul 2, 2014 at 18:19
  • i didn't try that, i'm trying to shutdown or reboot from the gui
    – user299731
    Jul 2, 2014 at 18:20

3 Answers 3

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Does any of the below work?

sudo shutdown -r now
sudo shutdown -H now
sudo shutdown -P now

sudo shutdown -rv now

will verbose you while trying a reboot.

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try this one 1st reset unity & ubuntu desktop

$ sudo apt-get update
$ sudo apt-get install --reinstall ubuntu-desktop
$ sudo apt-get install unity
$ setsid unity

if this didnt work

$ gksu "gedit /etc/default/grub"

change this line

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

by this

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"

save then update grub by typ

$ sudo grub-update
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  • both the solutions didnt work
    – user299731
    Jul 2, 2014 at 18:53
  • upgrade it again $ sudo apt-get update && sudo apt-get dist-upgrade && sudo shutdown -r
    – hwez
    Jul 2, 2014 at 19:31
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I had the same problem on Ubuntu 14.04.2 LTS, and finally after many, many hours of searching and experimenting I think I have a solution at least for the class of netbooks/laptops supporting UEFI boot mode (my laptop is ACER TravelMate B115):

In BIOS, under Boot, change Boot Mode to UEFI (after installing Ubuntu in Legacy mode).

This solution does not not require changing grub configuration file /etc/default/grub (by adding ACPI=off and/or ACPI=force to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"), which was questionable in 1st place anyway.

In my investigation I tried:

  • installing Ubuntu 14.04.2 LTS from scratch
  • updating Ubuntu to use latest
  • changing grub parameters
  • upgrading to Ubuntu 15.04
  • upgrading BIOS to the latest for TravelMate B115 (V122 to V126)
  • analysing the syslog

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