Grub installation failure when installing Ubuntu with SSD

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http://askubuntu.com – I want to install Ubuntu on a Vaio S series with 256GB SSD. But Ubuntu cannot install the grub boot loader. What should I do? I face the same problems as this question, but there is no answer to it. I have Windows as well and I don't want to loss my data on that. My options for selecting boot-loader partition is /dev/mapper /dev/mapper/..... (a lot of them) Please help. (HowTos)