postinst is in libxine1-console 1.1.21-2ubuntu1.
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 | #! /bin/sh -e
DOCDIR=/usr/share/doc/libxine1-console
if [ -d "$DOCDIR" -a ! -L "$DOCDIR" ]; then
rmdir "$DOCDIR" && ln -s libxine1-bin "$DOCDIR"
fi
##
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