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I am a beginner and want to try Ubuntu for the first time.

I have the Lenovo Y700 laptop with UEFI (access to UEFI with "NOVO" button)

I want to install Ubuntu on my external HD (WD My Passport 1TB), without influencing the system boot, UEFI and the internal drive (with Win10 on it).

Now, I know that many users had problem after installing Ubuntu on an external HD on a PC with pre-installed windows in EFI mode.

As I understand, to prevent changes in the UEFI, one of the solutions is to install Ubuntu in Legancy mode. I don't mind to change between Legancy mode and the UEFI anytime i need to use either Win10 or Ubuntu.

So, i used Rufus with the image ubuntu-16.10-desktop-amd64.iso to make a bootable Ubuntu installation USB Stick first. I set it for MBR partition scheme for BIOS or UEFI in FAT32 file system.

Then I boot Ubuntu in Legancy mode, connected to the network and start the installation progress.

  1. I've chosen the boot loader to be installed in dev/sdd (my dedicated external drive).
  2. I created two partitions on my sdd drive: swap partition and main ext4 partition. there is another big NTFS partition that i don't want to use for Ubuntu.

When i press Install Now, instead the regular "write the changes to disks?" window to confirm the changes and start the installation, i get the following window:

go back to the menu and correct this problem?

The partition table format in use on your disks normally requires you to create a separate partition for boot loader code. This partition should be marked for use as “Reserved BIOS boot area” and should be at least 1 MB in size. Note that this is not the same as a partition mounted on /boot. If you do not go back to the partitioning menu and correct this error, bootloader installation may fail later, although it may still be possible to install the boot loader to a partition.

there are two options:

  1. Go Back - to create the "Reserved BIOS boot area" partition.
  2. Continue

Which of these i need to choose, in order to not make any changes to my internal drive, to the UEFI settings and to not harm the WIN10 boot?

Thanks!

  • You must create a BIOS Boot Partition that's used to store part of GRUB. – Rod Smith Oct 27 '16 at 13:48
  • rod smith, using Gparted? so i need to create unformatted partition (BIOS Boot Partition) within the sdd (external drive) at 1mb? how to menage flags? "legancy_boot"? it will not harm the UEFI and win10 boot? – gentlegiant Oct 27 '16 at 19:51

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