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Context :

I have tried to reinstall Linux Ubuntu on my laptop - along with windows - but after reboot GRUB starts in command line.

I've tried some manipulations and end to supress the partitions dedicated to ubuntu (from windows disk manager) - I realize it was probably not a good idea..

Thus, reinstalling Ubuntu from a USB Key now seems the unique option.

Problem :

Trying to boot from a Live USB (freshly created with the last Ubuntu LTS 16.04.03 image), I've entered the following commands :

set root=(hd0)
chainloader /EFI/BOOT/BOOTx64.EFI
boot

but it returns the following message :

Booting in insecure mode
Failed to find fs: Unsupported
Failed to load image \EFI\BOOT\grubx64.efi: Unsupported
start_image() returned Unsupported
error: unknown error.

Do you have an idea of what's possible to do ?

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    You normally boot an installer directly from UEFI/BIOS, not from another grub. & how you boot UEFI or BIOS is then how it installs. If you have booted into grub with UEFI, then you are not using UEFI's default of /EFI/Boot/bootx64,.efi (for external devices or fallback entry) but need to boot grubx64.efi. In trying to do this with a CD/DVD, I found case to also be important, but with flash drive and FAT32, case should not matter.
    – oldfred
    Commented Aug 29, 2017 at 16:34
  • Hi Olfred, thanks for your answer ! I have found a way to boot on the live USB by copying instructions related to "Try Ubuntu without installing" as written in EFI/boot/grub/grub.cfg, completing them with set root and boot: <pre> set root=(hd0) set gfxpayload=keep linux /casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash --- initrd /casper/initrd.lz boot <code>
    – Alexandre
    Commented Aug 29, 2017 at 17:26

1 Answer 1

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Well, I have found a way to boot on the live USB by copying instructions related to "Try Ubuntu without installing" as written in/boot/grub/grub.cfg, completing them with set root and boot :

set root=(hd0) 
set gfxpayload=keep
linux   /casper/vmlinuz.efi  file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
initrd  /casper/initrd.lz
boot

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