Manjaro does not boot due to kernel panic? Your Grub Customizer and oudated libcrypto.so.1.1 may be to blame

Symptoms:

Kernel panic when booting:

kernel panic - not syncing:

VFS: Unable to mount root fs on [...]

libcrypto.so.1.1 error in Grub Customizers, os-prober etc:

/etc/grub.d/bin/grubcfg_proxy: error while loading shared libraries: libcrypto.so.1.1: cannot open shared object file: No such file or directory

Solution:

1. Start by chrooting into your Manjaro installation, from a live or current system: sudo chroot [mount point of Manjaro partiton]/HP_P5_Manjaro

2. Mount the required file systems (only this version works, not the --bind one): mount -t proc none /proc mount -t sysfs none /sys mount -t devtmpfs none /dev mount -t tmpfs none /run

3. (Check via df -h and mount if things work)

4. Recreate the initramfs:
   sudo pacman -S mkinitcpio   and maybe sudo mkinitcpio -P for good measure

5. Remove any previous installations of GRUB customizer: sudo pacman -R grub-customizer

6. Backup the original GRUB configuration files: sudo cp -a /etc/default/grub /etc/default/grub.bak sudo cp -a /etc/grub.d /etc/grub.d.bak

7. Remove the old GRUB configuration files: sudo rm -rf /etc/default/grub sudo rm -rf /etc/grub.d

8. Reinstall GRUB using pacman, to recreate /etc/default/grub etc.:

9. pacman -S grub

10. Recreate the GRUB configuration: sudo grub-mkconfig -o /boot/grub/grub.cfg

11. Enable os-prober in GRUB: sudo sed -i 's/^#\(GRUB_DISABLE_OS_PROBER=false\)/\1/' /etc/default/grub

12. Update GRUB, for good measure: sudo update-grub

As code only:

sudo chroot /media/[your e.g. Ubuntu user name]/HP_P5_Manjaro

mount -t proc none /proc

mount -t sysfs none /sys

mount -t devtmpfs none /dev

mount -t tmpfs none /run

sudo pacman -R grub-customizer

sudo pacman -S mkinitcpio

sudo cp -a /etc/default/grub /etc/default/grub.bak

sudo cp -a /etc/grub.d /etc/grub.d.bak

sudo rm -rf /etc/default/grub

sudo rm -rf /etc/grub.d

pacman -S grub

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

sudo sed -i 's/^#\(GRUB_DISABLE_OS_PROBER=false\)/\1/' /etc/default/grub

sudo update-grub