Arch Linux

hollow_em

Member

Registered: 2021-07-09

Posts: 4

[SOLVED]Root device not found while booting new encrypted installation

Hello,

I tried installing arch with LVM on LUKS, however while trying to boot I get the following error.

ERROR: Device '/dev/mapper/MyVolGroup-root' not found. Skipping fsck.

It then drops me into an emergency shell.

The output of cat /proc/cmdline is the following.

BOOT_IMAGE=/vmlinuz-linux root=/dev/mapper/MyVolGroup-root rw cryptdevice=UUID=(device uuid):cryptlvm:allow-discards loglevel=3 quiet resume=/dev/mapper/MyVolGroup-swap

My hooks in /etc/mkinitcpio.conf are as follow.

HOOKS=(base udev autodetect keyboard keymap consolefont modconf block encrypt lvm2 filesystems fsck)

my /etc/default/grub contains the following.

GRUB_CMDLINE_LINUX_DEFAULT="cryptdevice=UUID=(device uuid):cryptlvm:allow-discards loglevel=3 quiet resume=/dev/mapper/MyVolGroup-swap"

I tried doing it manually with the following commands, this worked.

cryptsetup luksOpen /dev/nvme0n1p2 cryptlvm 
lvm vgchange -a y 
mount /dev/mapper/MyVolGroup-root /new_root
exit

Last edited by hollow_em (2021-07-10 09:00:22)

kermit63

Member

Registered: 2018-07-04

Posts: 174

Re: [SOLVED]Root device not found while booting new encrypted installation

Did you include lvm in the "GRUB_PRELOAD_MODULES" line in /etc/default/grub?

hollow_em

Member

Registered: 2021-07-09

Posts: 4

Re: [SOLVED]Root device not found while booting new encrypted installation

No I didn't, after adding it and running

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

I still get the same error.

kermit63

Member

Registered: 2018-07-04

Posts: 174

Re: [SOLVED]Root device not found while booting new encrypted installation

is /boot inside a luks2 encrypted partition? If so, GRUB can't handle luks2 encryption yet.

hollow_em

Member

Registered: 2021-07-09

Posts: 4

Re: [SOLVED]Root device not found while booting new encrypted installation

No /boot is unencrypted on my /dev/nvme0n1p1 partition. my root /home and swap are on /dev/nvme0n1p2.

progandy

Member

Registered: 2012-05-17

Posts: 5,190

Re: [SOLVED]Root device not found while booting new encrypted installation

hmm. I used the systemd initramfs, so what I had written was not applicable here.

Last edited by progandy (2021-07-10 08:03:08)

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hollow_em

Member

Registered: 2021-07-09

Posts: 4

Re: [SOLVED]Root device not found while booting new encrypted installation

According to this https://gist.github.com/kylemanna/cde14 … ac16b85458 nvme won't work on grub. I solved the issue by installing systemd-boot instead.

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,645

Re: [SOLVED]Root device not found while booting new encrypted installation

That has not been true for like 5 years at least. But systemd-boot's configuration is simpler in  its limited scope so glad you've found a working solution

Last edited by V1del (2021-07-10 17:29:37)