[Bug 1836717] [NEW] Ubuntu-18.04.2 nightly system update caused plymouth initramfs failure

[paranioid factoid]

Public bug reported:

After last night's system update, gdm3 can no longer start a display
server. Looking into it, I found there was a failure building a new
initramfs. Running kernel 4.18.0-25-lowlatency. Here's the error
message. Have to type it in by hand as I'm using a pseudotty console on
the affected machine.

# update-initramfs -u -v

[blah blah]

Calling hook plymouth
Adding binary /usr/lib/x86_64-linux-gnu/plymouth//script.so
E: /usr/share/initramfs-tools/hooks/plymouth failed with return 1
Removing /boot/initrd-img-4.18.0-25-lowlatency.dpkg-bak
update-initramfs: failed for /boot/initrd.img-4.18.0-25-lowlatency with 1
#

Please note the double slash between "plymouth//script.so" which is in
the text of the error message.

I did attempt to reinstall plymouth.

# apt-get install --reinstall plymouth-*

which worked, in that it reinstalled, but did not succeed in rebuilding
the kernel initramdisk.

** Affects: plymouth (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1836717

Title:
  Ubuntu-18.04.2 nightly system update caused plymouth initramfs failure

Status in plymouth package in Ubuntu:
  New

Bug description:
  After last night's system update, gdm3 can no longer start a display
  server. Looking into it, I found there was a failure building a new
  initramfs. Running kernel 4.18.0-25-lowlatency. Here's the error
  message. Have to type it in by hand as I'm using a pseudotty console
  on the affected machine.

  # update-initramfs -u -v

  [blah blah]

  Calling hook plymouth
  Adding binary /usr/lib/x86_64-linux-gnu/plymouth//script.so
  E: /usr/share/initramfs-tools/hooks/plymouth failed with return 1
  Removing /boot/initrd-img-4.18.0-25-lowlatency.dpkg-bak
  update-initramfs: failed for /boot/initrd.img-4.18.0-25-lowlatency with 1
  #

  Please note the double slash between "plymouth//script.so" which is in
  the text of the error message.

  I did attempt to reinstall plymouth.

  # apt-get install --reinstall plymouth-*

  which worked, in that it reinstalled, but did not succeed in
  rebuilding the kernel initramdisk.

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