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I have installed the latest ubuntu version 12.04 LTS,and everytime my wife logs on to her account we got problems to shut the computer off.It always returns to a log in promt on my account.Then its impossible to turn the computer off other than pressing the power button until it switches off by itself.All the passwords are also a hassle. Is there somebody who can help me with this? Best regards Geir A

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When you log out of your account, what actions do you perform? – edwin Jun 24 '13 at 23:07
Is the computer on a network where other users can login? Is anyone logging in as a root after logging in as a regular user? – Devyn Collier Johnson Jun 24 '13 at 23:31

From a terminal while you're logged in try:

sudo shutdown -h now 
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