Unable to boot into Manjaro encrypted device after update

After updating my OS last night I was seeing this error after reboot:

Error: grub_is_using_legacy_shim_lock_protocol not found

Yup, didn't read the update/release notes (as usual). So needed to do some digging around until I found a solution that worked for me.

My OS is installed in sda, so there are two partition in it: sda1 (boot, EFI System) and sda2 (the encrypted device, Linux filesystem).

Since I'm using LUKS encryption there were some steps I needed to follow to fix my OS:

First, boot using a Manjaro live USB stick (so I'm able to type commands and access my boot and my encrypted partition).
Go into a terminal and open the encrypted partition (for me it'd be sda2):
```
sudo cryptsetup open /dev/sda2 a2
```
Mount it:
```
sudo mount /dev/mapper/a2 /mnt
```
Create mount point for the boot/EFI partition:
```
sudo mkdir -p /mnt/boot/efi
```
Mount the problematic boot partition there (sda1 in this case):
```
sudo mount /dev/sda1 /mnt/boot/efi
```
Log in with manjaro-chroot:
```
sudo manjaro-chroot /mnt
```
Install grub:
```
install-grub
```

Exit, unmount everything and reboot:

exit
sudo umount -R /mnt
sudo shutdown -r now

That's it. Hopefully it'll help someone else.

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