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

[Pascal Hambourg]

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' {
> load_video
> 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 
> cryptdevice=UUID=e31ab127-91fc-4916-b7bf-b485a508c8cb:cryptroot 
> root=/dev/mapper/cryptroot

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.