Ubuntu – Stuck on reboot and shutdown


I've recently installed Ubuntu 12.04 and I love it. However I have one problem- I am unable to shutdown or reboot properly.

When I shutdown my laptop (Acer Aspire 5560) it hangs on the 5 dots and stays there.

When I reboot my laptop it does shutdown but when it boots back up it stay's on the Purple screen (no logo what so ever)

Thing's I've I'd to stop this:

  • sudo service network-manager stop before shutdown – nothing

  • Adding some lines the the GRUB file – nothing

  • installed other Ubuntu versions – nothing
  • sudo shutdown -h now – nothing

and some more.

At the moment I see a black screen in front of me with the text

 Asking all remaining processes to terminate [OK]

And the 5 dots with only the last one orange.

On other tries I got this thing:

modem-manager:could not get the system bus......

I first had Ubuntu dual boot Windows. And then it worked fine. However after a fresh install of Ubuntu alone I got this.

Best Answer

I had a similar problem with a Dell XPS 15z which I resolved by adding acpi=noirq to the kernel arguments:

sudo editor /etc/default/grub


GRUB_CMDLINE_LINUX_DEFAULT="acpi=noirq quiet splash"


sudo update-grub

Note that previously I had been using acpi=off, which permitted me to boot, but not shutdown. Without any acpi flag, I was not able to boot.

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