Rescue Kernel Regeneration Fails After Leapp Upgrade with Errors: 'cp: cannot stat /boot/bls.conf' and 'sed: can't read /boot/loader/entries/<UUID>-0-rescue.conf: No such file or directory

Issue

• After performing a Leapp upgrade from RHEL 8.x to RHEL 9.x (or RHEL 9.x to RHEL 10.x), running the command to regenerate the rescue kernel and initial RAM disk:

  # /usr/lib/kernel/install.d/51-dracut-rescue.install add "$(uname -r)" /boot "/boot/vmlinuz-$(uname -r)"
  

  Results in the following error:

  cp: cannot stat '/boot/bls.conf': No such file or directory
  sed: can't read /boot/loader/entries/<UUID>-0-rescue.conf: No such file or directory