Public bug reported:

Context: livecd-rootfs build for ARM64 ubuntu images using the linux-
generic kernel

What changed: linux-image-generic-extra-* came into being and now linux-
image-generic-* depends on it.  When removed the zz-flash-kernel hook
for the kernel runs twice (postinst.d and postrm.d)

What happened:
 - Creating a container image (LXD, ...) livecd-rootfs starts with a server 
image with a kernel and removes the kernel.
 - The kernel postinst.d hook for flash-kernel (zz-flash-kernel) runs twice now 
(first for postinst and then for postrm).  On the second call there is no 
kernel installed and flash-kernel does not handle being called with no kernel 
present; the kernel removal operation fails at this point.

Looking for a solution where zz-flash-kernel/flash-kernel is tolerant of
this behavior such that kernel removal is possible.

** Affects: flash-kernel (Ubuntu)
     Importance: Critical
         Status: New

** Attachment added: "arm64_livecd-rootfs_flash-kernel.failure"

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  flash-kernel postrm.d script fails on kernel removal

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