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I am trying to dual boot Ubuntu 12.04 with Windows 7. The installer will only let me try to install on /dev/sdb which is my 32GB caching SSD. I have partitioned space for Ubuntu with Gparted.

Does anyone know what I am doing wrong?

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Thank you.

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It wants to install the bootloader to sdb. I am not sure about this, but maybe sda is not in the format to install grub? I do not see why it would not install into sda5 either. – Martin Ueding Aug 18 '12 at 20:25

If the disk has been used in a RAID array you might need to erase the metadata. Open terminal Ctrl+Alt+T and run following command:

sudo dmraid -E -r /dev/sda


You might also find that you need to create a partition table in GParted (Device > Create Partition Table) before the disk will be available in the Installer.

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Yes, that's exactly what I needed! – Dan May 30 '13 at 15:52

don't do the guided partition scheme, do it manually.

if you want even more control, download the alternate install disk

but if you've never done it before, i wouldn't suggest doing it unless you have another computer or source of internet to answer questions and get help along the way

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Check this out. If you have a preexisting Windows install, I believe you don't want grub on /dev/sda because the windows bootloader is already there and that's best left as is.

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