[Bug 1773476] [NEW] linux-firmware 1.157.19 attempts to generate /boot/initrd.img-4.8.0-56, /boot/initrd.img-4.8.0 when no corresponding vmlinuz present

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With LinUX Images/-Extras 4.15.0-22-generic, 4.13.0-43-generic,
4.8.0-58-generic, 4.8.0-56-generic, and 4.4.0-127-generic installed,
sudo dpkg-reconfigure linux-firmware returns the following to Console:

update-initramfs: Generating /boot/initrd.img-4.15.0-22-generic
update-initramfs: Generating /boot/initrd.img-4.13.0-43-generic
update-initramfs: Generating /boot/initrd.img-4.8.0-58-generic
update-initramfs: Generating /boot/initrd.img-4.8.0-56-generic
update-initramfs: Generating /boot/initrd.img-4.8.0-56
WARNING: missing /lib/modules/4.8.0-56
Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/4.8.0-56: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_AlVft4/lib/modules/4.8.0-56/modules.order: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_AlVft4/lib/modules/4.8.0-56/modules.builtin: No such file or directory
update-initramfs: Generating /boot/initrd.img-4.8.0
WARNING: missing /lib/modules/4.8.0
Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/4.8.0: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_OwnjIb/lib/modules/4.8.0/modules.order: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_OwnjIb/lib/modules/4.8.0/modules.builtin: No such file or directory
update-initramfs: Generating /boot/initrd.img-4.4.0-127-generic

Same configuration report for "Setting up linux-firmware..." with sudo
apt(-get) install (--reinstall) linux-firmware and sudo apt-get upgrade
linux-firmware.  Therefore:

Reproducible: Always
Steps to reproduce: sudo apt install (--reinstall) linux-firmware or sudo dpkg-reconfigure linux-firmware.
Actual results, excepting actually installed Kernel Image packages:

update-initramfs: Generating /boot/initrd.img-4.8.0-56
WARNING: missing /lib/modules/4.8.0-56
Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/4.8.0-56: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_AlVft4/lib/modules/4.8.0-56/modules.order: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_AlVft4/lib/modules/4.8.0-56/modules.builtin: No such file or directory
update-initramfs: Generating /boot/initrd.img-4.8.0
WARNING: missing /lib/modules/4.8.0
Ensure all necessary drivers are built into the linux image!
depmod: ERROR: could not open directory /lib/modules/4.8.0: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_OwnjIb/lib/modules/4.8.0/modules.order: No such file or directory
depmod: WARNING: could not open /var/tmp/mkinitramfs_OwnjIb/lib/modules/4.8.0/modules.builtin: No such file or directory

Expected results, excepting actually installed Kernel Image packages:

No attempt to generate /boot/initrd.img for missing kernels, thus no
warnings, errors or fatals.

---
ApportVersion: 2.20.1-0ubuntu2.17
Architecture: amd64
CurrentDesktop: Unity
Dependencies:

DistroRelease: Ubuntu 16.04
InstallationDate: Installed on 2017-05-17 (373 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
Package: linux-firmware 1.157.19 [origin: unknown]
PackageArchitecture: all
ProcVersionSignature: Ubuntu 4.15.0-22.24~16.04.1-generic 4.15.17
Tags: xenial third-party-packages
Uname: Linux 4.15.0-22-generic x86_64
UnreportableReason: This is not an official Ubuntu package. Please remove any third party package and try again.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: xenial
-- 
linux-firmware 1.157.19 attempts to generate /boot/initrd.img-4.8.0-56, /boot/initrd.img-4.8.0 when no corresponding vmlinuz present
https://bugs.launchpad.net/bugs/1773476
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