Windows 7, Windows 8, than ubuntu 12.04

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http://askubuntu.com – I had Windows 7, than I have instaled Windows 8 (dual boot), and they work fine. Windows 8 was normaly loaded, windows 7 have to rebot first from Win8 boot menu. Now, when I have installed Ubuntu 12.04. I can access Windows 7 normaly, but when I want to access Windoows 8 I can't, system reboot and I am again on GRUB loader. (HowTos)