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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/..... (a lot of them)

Please help.

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It looks like you have some kind of RAID installation. /dev/mapper/ is associated with FakeRAID. See help.ubuntu.com/community/FakeRaidHowto –  user68186 Oct 26 '12 at 15:31
i have already chose any place under /dev/mapper/... to install boot loader on but it didn't work! –  hasan Oct 27 '12 at 9:43
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