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Grub on usb to boot hard drive how to#
Grub on usb to boot hard drive iso#

Most firmware offers the choice nowadays.

Grub on usb to boot hard drive iso#

To boot from a rescue media, select either the CD ISO image or the image for USB sticks. Generate the GRUB configuration file: # update-grubĪt the author's web page,, you will find updated direct links to all sorts of packaging.Reinstall GRUB to the appropriate disk (without partition number): # grub-install /dev/sdb.Chroot into the broken system: # chroot /mnt.Bind mount various virtual filesystems: # for i in /dev /dev/pts /proc /sys /sys/firmware/efi/efivars /run do sudo mount -B $i /mnt$i done The mount executable supplied with busybox does not support the -B option, use "mount -o bind" in this case.For example, for a system with an EFI partition on /dev/sdb1, an unencrypted /boot partition on /dev/sdb2, and a LUKS-encrypted / partition on /dev/sdb3, do: # cryptsetup luksOpen /dev/sdb3 crypt

Grub on usb to boot hard drive how to#

The exact details of how to do this depend on the particulars of your installation. Mount the broken system somewhere into the running filesystem.

If the directory /sys/firmware/efi/efivars is empty, you need to boot the rescue system including the kernel option "efi=runtime" and mount the EFI variables before proceeding: # mount -t efivarfs none /sys/firmware/efi/efivars.

You can verify that the system has booted using UEFI by checking for the existence of the directory /sys/firmware/efi or by running efibootmgr. (The following procedure is described in greater detail here.)īoot (using UEFI) into a live system, such as a DebianLive CD/USB or the Debian installer in rescue mode. Using A Live CD/USB To Fix Your Current System To reinstall grub, you need either a live CD/USB to access your current system, or you can use the rEFInd boot manager on a live CD/USB to boot your current system.

Problem2: EFI boot entries disappear after reboot.

Problem1: Weak EFI implementation only recognizes the fallback bootloader.

Reinstalling grub-efi on your hard drive.

Boot your computer with the Refind media.

Using A Live CD/USB To Fix Your Current System.