Happens on kubuntu 18.10 too.
dkms: rtl8812au and bcmwl

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https://bugs.launchpad.net/bugs/1647511

Title:
  During kernel upgrade, /usr/sbin/dkms falsely reports that initrd.img
  won't be created

Status in DKMS:
  Confirmed
Status in One Hundred Papercuts:
  Confirmed
Status in dkms package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu release
  ==============

  Description:  Ubuntu 16.04.1 LTS
  Release:      16.04

  Version of package
  ==================

  dkms:
    Installed: 2.2.0.3-2ubuntu11.3
    Candidate: 2.2.0.3-2ubuntu11.3
    Version table:
   *** 2.2.0.3-2ubuntu11.3 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages
          100 /var/lib/dpkg/status
       2.2.0.3-2ubuntu11 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages

  The problem
  ===========

  When setting up `linux-image-4.4.0-53-generic`, the following warning
  appears three times:

      : Unable to find an initial ram disk that I know how to handle.
      Will not try to make an initrd.

  However, when setting up `linux-image-extra-4.4.0-53-generic`, the
  following message appears:

      update-initramfs: Generating /boot/initrd.img-4.4.0-53-generic

  The text "Unable to find an initial ram disk" appears in
  `/usr/sbin/dkms`, though it may appear elsewhere.

  What should happen
  ==================

  The warning message should not appear.

  Messages when setting up the two packages
  =========================================

  Setting up linux-image-4.4.0-53-generic (4.4.0-53.74) ...
  Running depmod.
  update-initramfs: deferring update (hook will be called later)
  Examining /etc/kernel/postinst.d.
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/dkms 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  : Unable to find an initial ram disk that I know how to handle.
  Will not try to make an initrd.
  : Unable to find an initial ram disk that I know how to handle.
  Will not try to make an initrd.
  : Unable to find an initial ram disk that I know how to handle.
  Will not try to make an initrd.
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  update-initramfs: Generating /boot/initrd.img-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-53-generic /boot/vmlinuz-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
  Found linux image: /boot/vmlinuz-4.4.0-53-generic
  Found initrd image: /boot/initrd.img-4.4.0-53-generic
  Found linux image: /boot/vmlinuz-4.4.0-51-generic
  Found initrd image: /boot/initrd.img-4.4.0-51-generic
  Found linux image: /boot/vmlinuz-4.4.0-47-generic
  Found initrd image: /boot/initrd.img-4.4.0-47-generic
  Adding boot menu entry for EFI firmware configuration
  done
  Setting up linux-image-extra-4.4.0-53-generic (4.4.0-53.74) ...
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/dkms 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  update-initramfs: Generating /boot/initrd.img-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-53-generic /boot/vmlinuz-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-53-generic 
/boot/vmlinuz-4.4.0-53-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
  Found linux image: /boot/vmlinuz-4.4.0-53-generic
  Found initrd image: /boot/initrd.img-4.4.0-53-generic
  Found linux image: /boot/vmlinuz-4.4.0-51-generic
  Found initrd image: /boot/initrd.img-4.4.0-51-generic
  Found linux image: /boot/vmlinuz-4.4.0-47-generic
  Found initrd image: /boot/initrd.img-4.4.0-47-generic
  Adding boot menu entry for EFI firmware configuration
  done

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: dkms 2.2.0.3-2ubuntu11.3
  ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
  Uname: Linux 4.4.0-53-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Dec  5 19:30:51 2016
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-11-01 (34 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 
20160624-10:47
  PackageArchitecture: all
  SourcePackage: dkms
  UpgradeStatus: No upgrade log present (probably fresh install)

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