Not a kernel issue. The grub hook that fails is provided by grub-customizer 
which only existed in Focal.
https://launchpad.net/ubuntu/+source/grub-customizer

That package should probably be removed from the system.

** Changed in: linux-signed (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/2100293

Title:
  package linux-image-5.15.0-118-generic 5.15.0-118.128 failed to
  install/upgrade: run-parts: /etc/kernel/postinst.d/zz-update-grub
  exited with return code 127

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