> could you set -x debug it or provide an easy way to trigger the bug?

After modifying the variable settings section in the ubuntu3.2 version
as like

. /usr/share/initramfs-tools/hook-functions

# my modifications - begin
#THEME_PATH="$(update-alternatives --query default.plymouth 2>/dev/null | sed 
-e '/^Value:/!d' -e 's/^Value: \(.*\)/\1/')"
#IMAGE_PATH=$(grep "ImageDir *= *" ${THEME_PATH} | sed 's/ImageDir *= *//')
#THEME="$(basename ${THEME_PATH:-none} .plymouth || true)"
THEME="none"
# alternatively press CTRL+D = EOF while hang during update-initramfs/apt-get 
dist-upgrade
# my modifications - end
THEMES="/usr/share/plymouth/themes"

helps, and update-initramfs runs through.


After adding set -x right after set -e in line 4 of the hook script of the 
ubuntu3.3 version and

> update-initramfs -u &> debug.txt

I got the debug.txt file in the attachment.


** Attachment added: "debug.txt"
   
https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1865959/+attachment/5333543/+files/debug.txt

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https://bugs.launchpad.net/bugs/1865959

Title:
  plymouth hook hangs waiting for input

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