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I finally managed to installed ubuntu. But I cannot boot win 8 now. I searched on the forum and tried everything without any luck.

Here is the log from boot-repair: http://paste.ubuntu.com/1389617/

@LovinBuntu: Here is the new URL: http://paste.ubuntu.com/1389617/

fossfreedom
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Altoman
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2 Answers2

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Your problem is that your GRUB configuration includes a BIOS/legacy-style boot entry for Windows, but your system is booting in EFI mode. There are a number of ways to fix this. One is to create your own custom Windows boot entry for GRUB in /etc/grub.d/40_custom. Something like this might work:

menuentry "Windows 7" {
    insmod part_gpt
    insmod chain
    set root='(hd0,gpt7)'
    chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

After creating that entry, type sudo update-grub to transfer it to the /boot/grub/grub.cfg file. I can't guarantee that this will work, though; what works for one installation doesn't always work for another.

Another approach is to install another boot manager, such as rEFInd or gummiboot. When installed as a primary boot manager, these tools will enable you to select Windows vs. GRUB, and you'll then use GRUB to select your kernel. Alternatively, either can boot a Linux kernel (version 3.3.0 or later) directly, bypassing GRUB entirely. Doing this optimally requires some reconfiguration, though; see this page on the rEFInd documentation for details.

Rod Smith
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http://www.intowindows.com/dual-boot-windows-8-and-ubuntu/ i find a link . and it is very good

NOTE : if answer is true ; please confirm answer