postinst is in uuid-runtime 2.20.1-1ubuntu3.
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 14 15 | #!/bin/sh
set -e
if ! getent group | grep -q libuuid; then
groupadd -f -K GID_MIN=1 -K GID_MAX=999 libuuid
fi
if ! getent passwd | grep -q libuuid; then
useradd -d /var/lib/libuuid -K UID_MIN=1 -K UID_MAX=499 -g libuuid libuuid
fi
chown libuuid:libuuid /usr/sbin/uuidd
chmod 6755 /usr/sbin/uuidd
exit 0
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