[lubuntu] grub-install failed /dev/sda fatal error

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http://ubuntuforums.org – I installed Ubuntu 12.10 alpha 2 and got this problem at the end of d installation. I now sit with an installed Ubuntu with no bootloader..... I tried millions of times from other liveCD of ubuntu 10.10 12.04 to reinstall grub but still grub won't install. anyone help plz (Hardware)