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I have a 120 Gb SSD drive (/dev/sda) where Win7 is installed and a second internal drive (/dev/sdb) that I use for data storage. Both of them have GPT partition tables.

Now, I want to install Ubuntu on the secondary drive and so I partitioned it in this way: EFI (fat32), root (ext4), home (ext4) and Data (NTFS).

I want the installation to be fully separate from Windows: at startup, Windows must load automatically without selecting it by grub menu, instead if I want to use Ubuntu I should simply select it in the bios boot override section.

I made an attempt and I selected /dev/sdb as boot loader destination, but at the end of the installation I strangely found it in the EFI partion of /dev/sda drive instead!

That's not what I want of course. For example, if I decide to format the primary drive for some reason, then I must be able to continue to use Ubuntu on the other drive with no problems and vice versa!

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You will have to remove your harddrives to do this:

  • Remove the second harddrive
  • Install a bootloader to /dev/sda
  • Insert the second harddrive and remove the SSD
  • Install Ubuntu on the second harddrive. Install the bootloader to /dev/sdb
  • Insert the SSD again

works with USB pendirves, too.

Tested with Ubuntu 15.04, 14.04, Arch and OpenSuse

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  • Thank you very much for your answer man! On /dev/sda the bootloader already exists, in fact I created a GPT partition table with Gparted, then I initialized the drive during Win7 installation and the EFI partition containing Windows Boot Manager was automatically created. During Ubuntu installation, In order to install the bootloader to /dev/sdb, should I select the EFI partition I manually created when I partitioned the drive? – Generoso May 2 '16 at 18:59
  • as you will have to install the bootloader into an EFI partition you should the partition you created. – LittleByBlue May 3 '16 at 11:08

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