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I cannot restart, reboot or shut-down my PC using Natty. Whenever I hit shut-down, restart or in terminal sudo reboot it shows a black screen. If I should press down the power button for while, it is forced off.

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when did you get this problem? after install a application or what? – shantanu Jul 26 '11 at 13:06
Does 'sudo shutdown -h now' work? – Thomas Ward Feb 24 '12 at 0:25
It might be helpful if you could tell us more about your device, particularly brand and model. – fragos Feb 25 '12 at 3:06

Ctrl+Alt+Backspace will kill the X-server and bring you back to the log-on screen. You should be able to dismiss the session there using the shut-down / log-off / restart button.

If that fails to render the satisfaction of shutting down the machine then Ctrl+Alt+F1 which puts you directly into the shell-propmt.

sudo shutdown -h now

or to reboot Ctrl+Alt+Del

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Bounty awarded due to the detailing of methods which will gain the desired result. – Thomas Ward Feb 29 '12 at 7:57
Thanks for added rep – Ringtail Feb 29 '12 at 17:14
Does it the correct answer? – Kit Ho Mar 30 '12 at 14:41

A few things you should check:

Check if this works to reboot: sudo shutdown -r now

If it doesn't, copy the console output and paste here. It should give a hint of what's is wrong you your installation.

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'shutdown -r' is identical to 'reboot', which the OP says causes a black screen to appear. – bessman Feb 24 '12 at 23:34

This is more likely a bug of some sort that is causing this, which it has been happening more on 11.10 rather than Natty but much discussion has been focused on this occurrence and there are numerous threads on this site concerning the problem. Below is a link to one of the more in-detail discussion on the following matter.

New computer hangs on shutdown/reboot, how to troubleshoot?

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you could try pressing the power button for awhile.

or try the following key combo.

ctrl+alt then press the following keys in following order (while keeping hold of ctrl+alt) prtscn reisou

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That should be reisuo. And it's only Alt+PrtSc, no Ctrl. – bessman Feb 24 '12 at 21:49

When you turn it back on go into Keyboard > Layouts > Options > Key Seqence to Kill X Server.

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Have you recently install a dhcp server onto your computer? I have noticed a few, unable to shutdown or restart, problems directly after installation.

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