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I'm trying to install Ubuntu on my external hard-disk. Since I already have some files on that HDD, I created unallocated free space in order to install Linux on there.

I am able to install it, however, I have to make a separate EFI partition - it does not allow me to install without it. But, in the end, I cannot boot Linux from the HDD as it doesn't show in the Boot menu. Or rather, it shows, but upon selecting it goes into Windows Repair Mode.

Do you think such an installation is possible and what could be the problem? As for the EFI, my computer uses Legacy BIOS but I cannot seem to install without it.

  • Is Windows UEFI or BIOS? And how you boot install media, UEFI or BIOS is then how it installs.If using an ESP - efi system partition then you are installing in UEFI boot mode. You can have external in UEFI, but grub will not boot BIOS install on internal. May be best to see details, use ppa version with your live installer (2nd option) or any working install, not older Boot-Repair ISO: Please copy & paste the pastebin link to the Boot-info summary report ( do not post report), the auto fix sometimes can create more issues. help.ubuntu.com/community/Boot-Repair – oldfred May 16 '20 at 2:48

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