Problems reinstalling bootloader after a Windows update

[Adam Mercer]

Hi

I dual boot my Fedora 35 system with Windows 10 and a Windows update
decided to remove the Fedora bootloader and I can no longer boot into
Linux.

I've booted from the Live CD and chrooted into my system after
mounting /boot and /boot/efi, I've then been following the
instructions here:

https://fedoraproject.org/wiki/GRUB_2#Instructions_for_UEFI-based_systems

and when I reinstall the grub packages I get the following error:

  Running scriptlet: grub2-common-1:2.06-8.fc35.noarch                   26/26
error: failed to exec scriptlet interpreter /bin/sh: Permission denied
warning: %posttrans(grub2-common-1:2.06-8.fc35.noarch) scriptlet
failed, exit status 127

Error in POSTTRANS scriptlet in rpm package grub2-common
  Running scriptlet: shim-unsigned-ia32-15.4-1.fc32.x86_64               26/26
error: failed to exec scriptlet interpreter /bin/sh: Permission denied
warning: %transfiletriggerin(glibc-common-2.34-8.fc35.x86_64)
scriptlet failed, exit status 127

Error in <unknown> scriptlet in rpm package shim-unsigned-ia32
error: failed to exec scriptlet interpreter /bin/sh: Permission denied
warning: %transfiletriggerpostun(glibc-common-2.34-8.fc35.x86_64)
scriptlet failed, exit status 127

Error in <unknown> scriptlet in rpm package shim-unsigned-ia32

Any idea what I'm doing wrong?

I have a system backup so all is not lost but surely I should be able
to reinstall the bootloader?

Cheers

Adam