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Re: Grub with UEFI, Luks, BTRFS and Separate boot device

From: Pascal Hambourg
Subject: Re: Grub with UEFI, Luks, BTRFS and Separate boot device
Date: Thu, 15 Jul 2021 00:04:20 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

Le 14/07/2021 à 22:39, James Johnson a écrit :

After I enter the Crypt password; I’m presented with a line that says Error: 
Failed to remount root and Kernel File System.
3 Partitions
1 ESP/Uefi with Boot on that same part
1 LUKS Encrypted partition (DM-Crypt)
A BTRFS logical part within the crypto partition
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os 
$menuentry_id_option 'gnulinux-simple-a73f9d6e-abcd-4dc0-a65b-76c2d7847acf' {
set gfxpayload=keep
insmod gzio
insmod btrfs
search --no-floppy --fs-uuid --set=root e31ab127-91fc-4916-b7bf-b485a508c8cb
echo 'Loading Linux linux ...'
# Randomusr changing first root reference for the kernel to the physical 
partition UUID for testing
linux /@/boot/vmlinuz-linux root=UUID=e31ab127-91fc-4916-b7bf-b485a508c8cb rw 
rootflags=subvol=@  loglevel=3 quiet 

1) You say that /boot is in the EFI system partition but the kernel seems to be loaded from the btrfs filesystem. 2) Why is the root= parameter present twice with different values in the kernel command line ?
3) The LUKS device and the root filesystem cannot have the same UUID.
4) Please post the output of lsblk --fs and the contents of /etc/fstab.

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