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KVM boot ERROR: device 'UUID=xxxx-51fb' not found. mount: /new_root: can't find UUID=xx [Resolved]

I'm installing Arch on a KVM VPS. I did this a couple days ago at one VPS provider and I was able to get Arch up and running without much problem. However, I'm trying out another VPS provider today and I ran into a problem I haven't been able to solve.

I'm installing Arch by mounting an ISO image as a CD Rom, booting into the Arch ISO and doing a manual install. Everything seems to go fine, but when I unmount the "CD Rom" and reboot, the error is:

ERROR: device 'UUID=fd92f3e7-f092-48c7-9f16-d94ba3de51fb' not found. Skipping fsck.
mount: /new_root: can't find UUID=fd92f3e7-f092-48c7-9f16-d94ba3de51fb.
You are now being dropped into an emergency shell.
sh: can't access tty: job control turned off
[rootfs ]#

I'm using GTP and a bios boot partition as shown in these partitioning steps:

gdisk /dev/sda

Number  Start (sector)    End (sector)  Size       Code  Name
1            2048            4095   1024.0 KiB  EF02  BIOS boot partition
2            4096        25169919   12.0 GiB    8300  Linux filesystem
3        25169920        41943006   8.0 GiB     8200  Linux swap

Here are my steps leading up to pacstrap:

mkfs.btrfsk /dev/sda2
mkswap /dev/sda3
swapon /dev/sda3

mount /dev/sda2 /mnt
pacstrap -i /mnt 
pacstrap -i /mnt base base-devel linux-lts.... btrfs-progs grub ...
genfstab -U -p /mnt >> /mnt/etc/fstab

Here' is the generated fstab:

# /dev/sda2
UUID=fd92f3e7-f092-48c7-9f16-d94ba3de51fb       /               btrfs           rw,relatime,space_cache,subvolid=5,subvol=/     0 0

# /dev/sda3
UUID=b1388b5c-0bd1-444b-9b2e-d1b39537326d       none            swap            defaults        0 0

I typically change the mount options to these:

UUID=fd92f3e7-f092-48c7-9f16-d94ba3de51fb       /               btrfs           rw,noatime,nodiratime,compress=lzo,space_cache,defaults,subvol=/        0 0

(BTW, both fstab versions give the same error shown above on rebooting.)

Next I do arch-chroot /mnt and then the normal installation steps... I'm keeping these details brief so I can show the steps related to grub, which is where I assume the problem is.

To /etc/mkinitcpio.conf, I add this binary:

BINARIES=(/usr/bin/btrfs)

Then I run the next two standard grub commands (output shown):

grub-install /dev/sda

Installing for i386-pc platform.
Installation finished. No error reported.

grub-mkconfig -o /boot/grub/grub.cfg

Generating grub configuration file ...
Found linux image: /boot/vmlinuz-linux-lts
Found initrd image: /boot/initramfs-linux-lts.img
Found fallback initrd image(s) in /boot: initramfs-linux-lts-fallback.img
Found linux image: /boot/vmlinuz-linux
Found initrd image: /boot/initramfs-linux.img
Found fallback initrd image(s) in /boot: initramfs-linux-fallback.img
done

after getting the network ready, etc., I reboot and remove the CD Rom. But the system fails to boot and gives the error shown above.

Here are all the config files and output that I think might be relevant:

root@archiso ~ # cat /mnt/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$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  fd92f3e7-f092-48c7-9f16-d94ba3de51fb
else
search --no-floppy --fs-uuid --set=root fd92f3e7-f092-48c7-9f16-d94ba3de51fb
fi
    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=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=5
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 $menuentry_id_option 'gnulinux-simple-fd92f3e7-f092-48c7-9f16-d94ba3de51fb' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod btrfs
        set root='hd0,gpt2'
        if [ x$feature_platform_search_hint = xy ]; then
        search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  fd92f3e7-f092-48c7-9f16-d94ba3de51fb
        else
        search --no-floppy --fs-uuid --set=root fd92f3e7-f092-48c7-9f16-d94ba3de51fb
        fi
        echo    'Loading Linux linux-lts ...'
        linux   /boot/vmlinuz-linux-lts root=UUID=fd92f3e7-f092-48c7-9f16-d94ba3de51fb rw  quiet
        echo    'Loading initial ramdisk ...'
        initrd  /boot/initramfs-linux-lts.img
}
submenu 'Advanced options for Arch Linux' $menuentry_id_option 'gnulinux-advanced-fd92f3e7-f092-48c7-9f16-d94ba3de51fb' {
        menuentry 'Arch Linux, with Linux linux-lts' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-lts-advanced-fd92f3e7-f092-48c7-9f16-d94ba3de51fb' {
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod btrfs
                set root='hd0,gpt2'
                if [ x$feature_platform_search_hint = xy ]; then
                search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  fd92f3e7-f092-48c7-9f16-d94ba3de51fb
                else
                search --no-floppy --fs-uuid --set=root fd92f3e7-f092-48c7-9f16-d94ba3de51fb
                fi
                echo    'Loading Linux linux-lts ...'
                linux   /boot/vmlinuz-linux-lts root=UUID=fd92f3e7-f092-48c7-9f16-d94ba3de51fb rw  quiet
                echo    'Loading initial ramdisk ...'
                initrd  /boot/initramfs-linux-lts.img
        }
        menuentry 'Arch Linux, with Linux linux-lts (fallback initramfs)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-lts-fallback-fd92f3e7-f092-48c7-9f16-d94ba3de51fb' {
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod btrfs
                set root='hd0,gpt2'
                if [ x$feature_platform_search_hint = xy ]; then
                search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  fd92f3e7-f092-48c7-9f16-d94ba3de51fb
                else
                search --no-floppy --fs-uuid --set=root fd92f3e7-f092-48c7-9f16-d94ba3de51fb
                fi
                echo    'Loading Linux linux-lts ...'
                linux   /boot/vmlinuz-linux-lts root=UUID=fd92f3e7-f092-48c7-9f16-d94ba3de51fb rw  quiet
                echo    'Loading initial ramdisk ...'
                initrd  /boot/initramfs-linux-lts-fallback.img
        }
        menuentry 'Arch Linux, with Linux linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-fd92f3e7-f092-48c7-9f16-d94ba3de51fb' {
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod btrfs
                set root='hd0,gpt2'
                if [ x$feature_platform_search_hint = xy ]; then
                search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  fd92f3e7-f092-48c7-9f16-d94ba3de51fb
                else
                search --no-floppy --fs-uuid --set=root fd92f3e7-f092-48c7-9f16-d94ba3de51fb
                fi
                echo    'Loading Linux linux ...'
                linux   /boot/vmlinuz-linux root=UUID=fd92f3e7-f092-48c7-9f16-d94ba3de51fb rw  quiet
                echo    'Loading initial ramdisk ...'
                initrd  /boot/initramfs-linux.img
        }
        menuentry 'Arch Linux, with Linux linux (fallback initramfs)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-fallback-fd92f3e7-f092-48c7-9f16-d94ba3de51fb' {
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod btrfs
                set root='hd0,gpt2'
                if [ x$feature_platform_search_hint = xy ]; then
                search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  fd92f3e7-f092-48c7-9f16-d94ba3de51fb
                else
                search --no-floppy --fs-uuid --set=root fd92f3e7-f092-48c7-9f16-d94ba3de51fb
                fi
                echo    'Loading Linux linux ...'
                linux   /boot/vmlinuz-linux root=UUID=fd92f3e7-f092-48c7-9f16-d94ba3de51fb rw  quiet
                echo    'Loading initial ramdisk ...'
                initrd  /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/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 ###

[root@archiso /]# cat /etc/default/grub

# GRUB boot loader configuration

GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="Arch"
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX=""

# Preload both GPT and MBR modules so that they are not missed
GRUB_PRELOAD_MODULES="part_gpt part_msdos"

# Uncomment to enable booting from LUKS encrypted devices
#GRUB_ENABLE_CRYPTODISK=y

# Uncomment to enable Hidden Menu, and optionally hide the timeout count
#GRUB_HIDDEN_TIMEOUT=5
#GRUB_HIDDEN_TIMEOUT_QUIET=true

# Uncomment to use basic console
GRUB_TERMINAL_INPUT=console

# Uncomment to disable graphical terminal
#GRUB_TERMINAL_OUTPUT=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
GRUB_GFXMODE=auto

# Uncomment to allow the kernel use the same resolution used by grub
GRUB_GFXPAYLOAD_LINUX=keep

# Uncomment if you want GRUB to pass to the Linux kernel the old parameter
# format "root=/dev/xxx" instead of "root=/dev/disk/by-uuid/xxx"
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
GRUB_DISABLE_RECOVERY=true

# Uncomment and set to the desired menu colors.  Used by normal and wallpaper
# modes only.  Entries specified as foreground/background.
#GRUB_COLOR_NORMAL="light-blue/black"
#GRUB_COLOR_HIGHLIGHT="light-cyan/blue"

# Uncomment one of them for the gfx desired, a image background or a gfxtheme
#GRUB_BACKGROUND="/path/to/wallpaper"
#GRUB_THEME="/path/to/gfxtheme"

# Uncomment to get a beep at GRUB start
#GRUB_INIT_TUNE="480 440 1"

# Uncomment to make GRUB remember the last selection. This requires to
# set 'GRUB_DEFAULT=saved' above.
#GRUB_SAVEDEFAULT="true"

[root@archiso /]# blkid

/dev/sr0: UUID="2017-04-01-11-29-57-00" LABEL="ARCH_201704" TYPE="iso9660" PTUUID="48d46635" PTTYPE="dos"
/dev/sda1: PARTLABEL="BIOS boot partition" PARTUUID="0102316e-d6ba-4896-b184-7d93bbd8fd1b"
/dev/sda2: LABEL="top_level" UUID="fd92f3e7-f092-48c7-9f16-d94ba3de51fb" UUID_SUB="9c7e449b-26f5-43d0-88a0-f7d01479cf82" TYPE="btrfs" PARTLABEL="Linux filesystem" PARTUUID="2758217d-bf0b-4036-aea0-26b68ae733f5"
/dev/sda3: UUID="b1388b5c-0bd1-444b-9b2e-d1b39537326d" TYPE="swap" PARTLABEL="Linux swap" PARTUUID="c48910f1-2483-4228-a0f4-952b2e9f101a"
/dev/loop0: TYPE="squashfs"

root@archiso ~ # lsblk -f

NAME   FSTYPE   LABEL       UUID                                 MOUNTPOINT
loop0  squashfs                                                  /run/archiso/sfs/airootfs
sda
+-sda1
+-sda2 btrfs    top_level   fd92f3e7-f092-48c7-9f16-d94ba3de51fb /mnt
+-sda3 swap                 b1388b5c-0bd1-444b-9b2e-d1b39537326d [SWAP]
sr0    iso9660  ARCH_201704 2017-04-01-11-29-57-00               /run/archiso/bootmnt

UPDATE 1: Since I didn't have any better ideas to try, in /etc/default/grub I enabled this option:

GRUB_DISABLE_LINUX_UUID=true

And I regenerated grub.cfg:

grub-mkconfig -o /boot/grub/grub.cfg

After that change, when I boot up the VPS, I get a similar error:

ERROR: device '/dev/sda2' not found. Skipping fsck.
:: mounting '/dev/sda2' on real root
mount /new_root: no filesystem type specified

Does that give a clue about what I'm missing?


Question Credit: MountainX
Question Reference
Asked December 5, 2018
Posted Under: Unix Linux
12 views
1 Answers

Hello surely you have realized your error by this time but for anyone else that makes the same mistake here is the root problem and the solution.

OP you have 3 partitions set up but failed to mount /dev/sda1 to the /boot folder. If anyone else makes this mistake simply add your missing partition and rerun the necessary commands again.

mount /dev/sda2 /mnt
mount /dev/sda1 /mnt/boot
genfstab -U -p /mnt >> /mnt/etc/fstab
arch-chroot /mnt
grub-mkconfig -o /boot/grub/grub.cfg

exit, unmount and reboot.

I hope this was straight forward and helpful. Best rearguards.


credit: Furikuri Yugi
Answered December 5, 2018
Your Answer
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