preinst is in vlock 2.2.2-8.
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
if test "$1" = upgrade -a "$2" = 2.2.2-6; then
# broken postrm removes vlock group during upgrade #838351
rm -f ${DPKG_ROOT:-}/var/lib/dpkg/info/vlock.postrm
fi
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