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I've had Ubuntu as the sole OS on my desktop for a couple years. Updated it to Precise soon after it came out. Today I decided to try dual booting to Windows 8. I bought a new, separate hard drive (SATA) to install Windows on. My Ubuntu installation is on my older PATA disk.

I disconnected the Ubuntu drive completely when installing Windows. It seemed to go OK.

I've now re-attached the disk with Ubuntu on it. I was able to boot to Ubuntu, run update-grub, and see that it recognized Windows 8. I now have a Windows 8 option in grub on startup.

However, when I select that option I get a couple seconds of the Windows boot screen, followed by a very brief flash of a "Your PC needs to restart" error message (see, and then the computer spontaneously reboots, and I end up back at the grub screen.

I'm not sure what to try next. Is this a windows security measure to prevent the OS from being loaded by some malicious bootloader? Is the mysterious "uefi" somehow to blame? Have I missed something obvious?

EDIT: This seems to be the same problem as Dual-boot Windows 8 and Ubuntu, separate HDD, Win8 boot failure from GRUB, but the accepted answer there is to buy a $25 copy of EasyBCD and boot from Windows. :(

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closed as too localized by Luis Alvarado Apr 10 '13 at 18:59

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

This question should instead be filed as a bug report, and as such is off-topic, thanks! Instructions on filing a bug report are here. – Jorge Castro Apr 10 '13 at 18:51