postrm is in plymouth-theme-script 0.8.8-0ubuntu17.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
set -e
if [ "x$1" = xremove ]; then
if which update-initramfs >/dev/null 2>&1
then
update-initramfs -u
fi
fi
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