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Well the title says it all. After the GUI button of shutdown responded to reboot. I have tried all the command there is but every time I shut down my laptop it reboots.

I tried

sudo halt

sudo poweroff

sudo shutdown -h now

I have a dell vostro 3400 with i3 and 4 GB RAM if that matters. Has anyone faced this problem. It was doing fine with 10.10

EDIT: Ok, seems like I can confine the problem to prevail during laptop usage from AC only rather than battery. As suggested I tried updating bios with the help of this but couldnot succeed.

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Have you checked the BIOS options? – Hello71 Apr 10 '11 at 2:47
yes I have and usually this happens when I use ubuntu for more than an hour or so. It would be behaving normally on shutdown during quick use but doesnot halt after a long run – sagarchalise Apr 10 '11 at 18:46
I would check for a BIOS update from Dell. – nerdy_kid Apr 11 '11 at 22:06
up vote 1 down vote accepted

Ok the problem seems to be laptop-mode-tools. I purged this package and viola all is well and I think after installing this package the problem started.

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