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I tested locally and confirmed that set -e in the generated postinst does catch run-parts failures even in the && expression — execution does not reach exit 0 when run-parts fails. My patch is therefore redundant. I am withdrawing it. The root cause remains 55-initrd.install silently returning exit 0 when initrd is missing (LP#2141741), which run-parts sees as success. That is where the fix belongs. This was my first patch to the kernel mailing list. I apologize for the noise and thank you both for taking the time to review it carefully. Jill Ravaliya