postinst is in ubuntu-app-launch 0.12+17.04.20170404.2-0ubuntu6.
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 11 12 13 | #!/bin/sh
set -e
# Make the setuid helper setuid
if [ "$1" = configure ]; then
chmod u+s /usr/lib/x86_64-linux-gnu/ubuntu-app-launch/oom-adjust-setuid-helper
fi
exit 0
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