[Bug 1866137] Re: /usr/share/initramfs-tools/hooks/plymouth hangs: no THEME_PATH

[Andreas Hasenack]

*** This bug is a duplicate of bug 1865959 ***
    https://bugs.launchpad.net/bugs/1865959

** This bug has been marked a duplicate of bug 1865959
   plymouth hook hangs waiting for input

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https://bugs.launchpad.net/bugs/1866137

Title:
  /usr/share/initramfs-tools/hooks/plymouth hangs: no THEME_PATH

Status in plymouth package in Ubuntu:
  Confirmed

Bug description:
  I'm doing a release upgrade from eoan to focal of my irc bouncer, and
  noticed it hanging when generating the initramfs:

  Setting up linux-generic (5.4.0.14.17) ...
  Processing triggers for initramfs-tools (0.136ubuntu1) ...
  update-initramfs: Generating /boot/initrd.img-5.4.0-14-generic
  (hangs)

  Process listing shows:
  /bin/sh /usr/share/initramfs-tools/hooks/plymouth
   \_ /bin/sh /usr/share/initramfs-tools/hooks/plymouth
       \_ grep ImageDir *= *
       \_ sed s/ImageDir *= *//

  The code is:
  THEME_PATH="$(update-alternatives --query default.plymouth 2>/dev/null | sed -e '/^Value:/!d' -e 's/^Value: \(.*\)/\1/')"
  IMAGE_PATH=$(grep "ImageDir *= *" ${THEME_PATH} | sed 's/ImageDir *= *//')

  THEME_PATH is empty:
  ubuntu at irc-proxy:~$ update-alternatives --query default.plymouth 2>/dev/null | sed -e '/^Value:/!d' -e 's/^Value: \(.*\)/\1/'
  ubuntu at irc-proxy:~$ update-alternatives --query default.plymouth
  update-alternatives: error: no alternatives for default.plymouth

  and grep is then waiting for something on its stdin, forever.

  At this moment, plymouth is version 0.9.4git20200109-0ubuntu3.2 from
  focal already.

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