Public bug reported:
In the fix for LP: #1864586 the following change was made:
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)"
THEMES="/usr/share/plymouth/themes"
Unfortunately, if the default.plymouth alternative is not set (as is the
case in the Raspberry Pi images for instance), then THEME_PATH winds up
blank. The introduced IMAGE_PATH line then hangs waiting for input (as
grep isn't given a filename to read).
I ran into this during an "apt upgrade" (which called update-initramfs,
and thus the plymouth hook) on a focal pi image; worked around it by
hitting Ctrl+D to let it continue, which allowed everything to proceed
as normal.
** Affects: plymouth (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1865959
Title:
plymouth hook hangs waiting for input
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