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I have a intel d525mw motherboard, on which I have ubuntu server.

When I go to reboot my machine(sudo reboot), it goes to the restart prompt and then just hangs there. I have also noticed this when I had freebsd on it.

It kills everything and drops to a shell view where the final line reads something like "[timestamp] restarting now" and then it just sits there and I manually have to reboot it.

Any idea what could be causing this?

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You should rewrite your question.. exactly how you reboot your machine when you say "when I go to reboot my machine" – barlop Dec 24 '10 at 9:05
i use "sudo reboot" – madmaze Dec 24 '10 at 16:08
up vote 2 down vote accepted

Got the same problem. Attach an (unpowered) monitor to it and it will reboot.

This seems to be a flaw in the BIOS that more people are reporting about.

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same motherboard? I hope they come out with a BIOS fix for that.. I need to be able to remotely reboot this machine – madmaze Dec 26 '10 at 14:15

There are some suggestions in this Ubuntu Forums thread.

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This solution worked for me:

In the /etc/default/grub file, add reboot=bios to the below line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash reboot=bios"

Now rebooting, halting and shutting down works properly.

Remember to run the following after the change is saved:

sudo update-grub
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