Used this or at least a very similar technique a few times to fix boot issues. I've got a version of the mounting command that I think is easier to use: for

Used this or at least a very similar technique a few times to fix boot issues. I've got a version of the mounting command that I think is easier to use: for f in proc sys dev run dev/pts ; do mount --bind /$f /mnt/$f ; done Change the "/mnt/$f" to whatever mountpoint that you're using which would be "/rescue/$f" to align with TFA. I don't know what difference it makes to have /run mounted, but once you chroot into the mountpoint you can mount the boot partition etc and run whatever grub or mkinitramfs command you need to fix stuff. I would leave the /boot mounting to later in the process - after you chroot. This way you can easily check /etc/fstab for where the boot partition lives (or if there is one), so you only need to locate the root partition initially which is generally easy to figure out from the disk sizes. There's extra steps needed however if the system uses LVM.