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Windows 8 is installed on SSD#1. Ubuntu 12.04 is installed on SSD#2.

After installing Ubuntu, I'm unable to boot from GNU GRUB to the Windows 8. When I try it, Windows logo flashes for a second and computer restarts.

I managed to log to the Windows by changing disk boot priority (SSD#1-Storage HDD-SSD#2). It had to repair itself first though. (fortunately didn't need the disk)

I had no such problem when I was trying Fedora 19 two days ago.

How to I fix it so Windows 8 can be booted from GRUB? $ sudo update-grub should fix it? I'm kind of scared of messing up the W8 - took me a long time to configure everything.

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Take a look at Boot-Repair, or Grub Customizer –  Mitch Oct 7 '13 at 12:23
    
It fixed the problem. Thank you (Boot-Repair on liveUSB) –  Marcin Oct 7 '13 at 14:34

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