I have to chroot to fix a broken system, probably caused by a misconfiguration in GRUB. Manjaro comes with a tool called manjaro-chroot that makes this process much easier, but not always works because, it expects a standard installation without encryption.

Standard Installation

With a standard installation with EXTx without encryption, you would use the following command:

manjaro-chroot -a

Encryption Installation

If you have an encrypted drive, you have to do the following:

Check your system drives

Run lsblk and find the drive you want to use. For this example I’m assuming the following output from lsblk:

1nvme0n1
2├─ nvme0n1p1 /boot/efi
3└─ nvme0n1p2 / 

Mount your drives

Login as root.

sudo -i

Open the encrypted drive, after this command you will be prompted for a password. This command will create an entry in /dev/mapper/ with the name of the last parameter nvmeEncrypted.

cryptsetup luksOpen /dev/nvme0n1p2 nvmeEncrypted

Mount the drives, the -o subvol=@ is needed if you use BTRFS.

mount -o subvol=@ /dev/mapper/nvmeEncrypted /mnt

Or if you have EXTx partition.

mount /dev/nvme0n1p2 /mnt/boot/efi

And finally chroot into the system.

manjaro-chroot /mnt

From here, you can fix/modify your system as you wish. If you have any grub issues running install-grub is your best bet.