postinst is in libblkid-dev 2.27.1-6ubuntu3.
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 | #!/bin/sh
set -e
# Automatically added by dh_installdeb
dpkg-maintscript-helper symlink_to_dir /usr/share/doc/libblkid-dev /usr/share/doc/libblkid1 2.25.2-5~ -- "$@"
# End automatically added section
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