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:

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.

Solution 1:

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

set

GRUB_CMDLINE_LINUX_DEFAULT="acpi=noirq quiet splash"

then

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.

You may try to these commands into terminal

For shutdown:

sudo halt

For shutdown:

sudo init 0

For restart:

sudo init 6

For shutdown:

sudo shutdown -h now

For hibernate:

sudo /etc/acpi/hibernate.sh