You are not logged in.
Yesterday I was not able to boot into Arch anymore. I found that my /boot/grub/grub.cfg was corrupted, its first half having been overwritten with zero-bytes. Not sure how this happened.
# hexdump -C /boot/grub/grub.cfg | head
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000c00 27 20 7b 0a 09 09 6c 6f 61 64 5f 76 69 64 65 6f |' {...load_video|
00000c10 0a 09 09 73 65 74 20 67 66 78 70 61 79 6c 6f 61 |...set gfxpayloa|
00000c20 64 3d 6b 65 65 70 0a 09 09 69 6e 73 6d 6f 64 20 |d=keep...insmod |
00000c30 67 7a 69 6f 0a 09 09 69 6e 73 6d 6f 64 20 70 61 |gzio...insmod pa|
00000c40 72 74 5f 6d 73 64 6f 73 0a 09 09 69 6e 73 6d 6f |rt_msdos...insmo|
00000c50 64 20 65 78 74 32 0a 09 09 73 65 74 20 72 6f 6f |d ext2...set roo|
00000c60 74 3d 27 68 64 30 2c 6d 73 64 6f 73 31 27 0a 09 |t='hd0,msdos1'..|
00000c70 09 69 66 20 5b 20 78 24 66 65 61 74 75 72 65 5f |.if [ x$feature_|The MBR appears to be fine, as the partitions are still recognized from the installation medium. In my device setup I am using sda1 as the boot partition and sda2 as the LUKS2-encrypted root partition. I can mount the boot partition and I can decrypt, mount and arch-chroot into root.
# fdisk -l /dev/sda
Disk /dev/sda: 223.57 GiB, 240057409536 bytes, 468862128 sectors
Disk model: SanDisk SSD PLUS
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x043390d0
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 411647 409600 200M 83 Linux
/dev/sda2 411648 468862127 468450480 223.4G 83 Linux# lsblk /dev/sda
sda 8:0 0 223.6G 0 disk
├─sda1 8:1 0 200M 0 part
└─sda2 8:2 0 223.4G 0 part
└─cryptroot 253:0 0 223.4G 0 crypt# blkid /dev/sda* /dev/mapper*
/dev/sda2: UUID="b1408c76-1677-4055-b5b0-42444fed81c1" TYPE="crypto_LUKS" PARTUUID="043390d0-02"
/dev/sda1: UUID="67bd7358-c1dd-4cac-8e4d-71aada781a8c" BLOCK_SIZE="1024" TYPE="ext4" PARTUUID="043390d0-01"
/dev/mapper/cryptroot: UUID="80288d9a-07b4-457f-89c2-ce098253360f" BLOCK_SIZE="4096" TYPE="ext4"I restored grub.cfg from backup. The machine still went to grub rescue instead of booting, so I I decided to reinstall grub and recreate the initramfs, following the wiki. However, I still cannot boot. The password prompt to decrypt root does not come up. Instead I still get grub rescue with this message:
error: no such device: 80288d9a-07b4-457f-89c2-ce098253360f.
error: unknown filesystem.
Entering rescue mode...Also grub rescue does not seem to be able to read the partitions:
grub rescue> ls (hd0,msdos1)
error: no such partition./etc/mkinitcpio.conf is configured with these hooks:
HOOKS=(base udev autodetect keyboard keymap consolefont modconf block encrypt filesystems fsck)From /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 quiet cryptdevice=UUID=b1408c76-1677-4055-b5b0-42444fed81c1:cryptroot:allow-discards,no-read-workqueue,no-write-workqueue root=/dev/mapper/cryptroot"
GRUB_ENABLE_CRYPTODISK=yFull /boot/grub/grub.cfg:
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
insmod part_gpt
insmod part_msdos
if [ -s $prefix/grubenv ]; then
load_env
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="0"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod ext2
search --no-floppy --fs-uuid --set=root 80288d9a-07b4-457f-89c2-ce098253360f
font="/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_input console
terminal_output gfxterm
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=4
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=4
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-80288d9a-07b4-457f-89c2-ce098253360f' {
load_video
set gfxpayload=keep
insmod gzio
insmod ext2
search --no-floppy --fs-uuid --set=root 80288d9a-07b4-457f-89c2-ce098253360f
echo 'Loading Linux linux ...'
linux /boot/vmlinuz-linux root=UUID=80288d9a-07b4-457f-89c2-ce098253360f rw loglevel=3 quiet cryptdevice=UUID=b1408c76-1677-4055-b5b0-42444fed81c1:cryptroot:allow-discards,no-read-workqueue,no-write-workqueue root=/dev/mapper/cryptroot
echo 'Loading initial ramdisk ...'
initrd /boot/intel-ucode.img /boot/initramfs-linux.img
}
submenu 'Advanced options for Arch Linux' $menuentry_id_option 'gnulinux-advanced-80288d9a-07b4-457f-89c2-ce098253360f' {
menuentry 'Arch Linux, with Linux linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-80288d9a-07b4-457f-89c2-ce098253360f' {
load_video
set gfxpayload=keep
insmod gzio
insmod ext2
search --no-floppy --fs-uuid --set=root 80288d9a-07b4-457f-89c2-ce098253360f
echo 'Loading Linux linux ...'
linux /boot/vmlinuz-linux root=UUID=80288d9a-07b4-457f-89c2-ce098253360f rw loglevel=3 quiet cryptdevice=UUID=b1408c76-1677-4055-b5b0-42444fed81c1:cryptroot:allow-discards,no-read-workqueue,no-write-workqueue root=/dev/mapper/cryptroot
echo 'Loading initial ramdisk ...'
initrd /boot/intel-ucode.img /boot/initramfs-linux.img
}
menuentry 'Arch Linux, with Linux linux (fallback initramfs)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-fallback-80288d9a-07b4-457f-89c2-ce098253360f' {
load_video
set gfxpayload=keep
insmod gzio
insmod ext2
search --no-floppy --fs-uuid --set=root 80288d9a-07b4-457f-89c2-ce098253360f
echo 'Loading Linux linux ...'
linux /boot/vmlinuz-linux root=UUID=80288d9a-07b4-457f-89c2-ce098253360f rw loglevel=3 quiet cryptdevice=UUID=b1408c76-1677-4055-b5b0-42444fed81c1:cryptroot:allow-discards,no-read-workqueue,no-write-workqueue root=/dev/mapper/cryptroot
echo 'Loading initial ramdisk ...'
initrd /boot/intel-ucode.img /boot/initramfs-linux-fallback.img
}
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg
fi
### END /etc/grub.d/41_custom ###Any ideas what I am missing?
Last edited by DomR (2022-05-08 18:00:11)
Offline
I figured out the solution. I had mounted the boot partition and the root partition separately and, after arch-chrooting into [mounted root], reinstalling grub there and exiting, copied the newly created files from [mounted root]/boot to [mounted boot]. What I had to do instead was mount the boot partition *inside* [mounted root] so that grub installs its files there directly. Now grub is finding its files and the machine boots as it used to.
Offline