Hello, the Latest Debian 11 setup confused me into not forcing UEFI setup on possibly UEFI-only computer.
And upon boot attempt it shows “no such cryptodisk” kind of grub rescue error. I Have tried to use Debian installation EFI USB drive to boot into rescue mode, mount cryptodisk, /boot using GUI and initiated grub reinstall on a /dev/sdX that i have verified using lsblk/df commands is correct drive. But mentioned boot error does not go away.
Which commands do You suggest please?
i have found some articles, but do not understand which/if apply on my issue case. Thank You
For UEFI you need to create a partition named /boot/efi. It must be vfat type. Here is how it looks on my Debian 11 server:
Filesystem Type 1K-blocks Used Available Use% Mounted on
udev devtmpfs 16354880 0 16354880 0% /dev
tmpfs tmpfs 3274780 1200 3273580 1% /run
/dev/mapper/md1_vg0-root ext4 950619836 325204964 577056268 37% /
tmpfs tmpfs 16373896 0 16373896 0% /dev/shm
tmpfs tmpfs 5120 0 5120 0% /run/lock
/dev/md0 ext4 944120 134500 744444 16% /boot
/dev/sda1 vfat 973952 3484 970468 1% /boot/efi
tmpfs tmpfs 3274776 0 3274776 0% /run/user/0
So you need two partitions for booting:
- /dev/sdb1 - vfat mounted at /boot/efi
- /dev/sdb2 - ext4 mounted at /boot/
Rest you can configure as per your needs.
This is what i have. Is it doable, what do you suggest?
and after i create it, i should grub-install (being chroot into my encrypted /root part. right?
Btw. here is some tutorial that is using gdisk, partprobe, mkfs commands, but i am unsure if it can apply on my case or which steps to omit etc.
If you have data, back it up. Then format everything and make partition schema for /boot and /boot/efi and rest of / fs and then install it.
Thanks for help , also what may work is something like following. If you are having different distribution, steps may be similar, not same. You are doing this on your own risk:
Use gparted to resize /boot partition to make room for new 40MB fat32 partition with esp, boot flags.
Boot Debian installer, Advanced options, Graphical rescue, …, answer passphrase (if have LVM encrypted drive), select /dev/hostname-vg/root as your root FS (or other appropriate /root). Confirm to mount /boot
Select to execute shell in above mentioned root path and run:
lsblk # to discover your small esp/efi partition path according to displayed size (lets say it is /dev/sda3 - used below)
mkdir /boot/efi && mount /dev/sda3 /boot/efi
DEBIAN_FRONTEND=dialog apt install grub-efi-amd64
grub-install --force-extra-removable --target=x86_64-efi --efi-directory=/boot/efi --recheck /dev/sdX # sdX being your Debian drive displayed by “lsblk”
some commands or switches may be redundant, i do not know which