postrm is in libgvc6-plugins-gtk 2.38.0-12ubuntu2.
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 | #!/bin/sh
set -e
# Update the configuration file (/usr/lib/graphviz/config6a)
if [ -x /usr/sbin/libgvc6-config-update ]; then
libgvc6-config-update -c
fi
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