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I am trying install ubuntu 12.04 among with win7. During hardware configuration I am receiving the following fatal error: "Executing 'grub-install/dev/sad' failed. Using the same installation disc in another pc the installation was completed without problems. What should I do?

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Are you installing from a live median such as a boot disk or are you installing from within windows then letting the computer reboot?

Also I am assuming that you meant grub-install/dev/sda and not grub-install/dev/sad

I believe your are getting this failure at the point when Stage 1 of GRUB installation is installing into the MBR which points to Stage 2 afterwards.

Post some more information about your hardware. Motherboard, cpu, age of computer, hard drives (and how did you partition it) etc....

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