Put the debian bootloader in /boot/efi and create an appropriate entry in the computer NVRAM grub-install Reinstall the grub-efi package apt-get install -reinstall grub-efi If the /boot/efi directory does not exist, you will need to create it. Choose your Linux Kernel and boot it.Ĭheck that the computer booted in computer in EFI mode: & echo 'EFI boot on HDD' || echo 'Legacy boot on HDD'Īfter starting a root shell (if you boot from a live media, you should start a chroot shell instead, as explained [[ |here) check that your EFI system partition (most probably /dev/sda1) is mounted on /boot/efi. Refind will parse your hard drive for installed kernels, and provide you a graphic menu to boot them. It is recommended to read the author's web pages to get a better understanding of what you are doing. If choosing the latter make sure to follow the instructions in the readme. Most firmware offers the choice nowadays. 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 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.

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