This file is indexed.

postinst is in gdm 3.0.4-0ubuntu15.

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.

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#!/bin/sh

set -e

. /usr/share/debconf/confmodule

THIS_PACKAGE=gdm
DEFAULT_DISPLAY_MANAGER_FILE=/etc/X11/default-display-manager

# creating gdm group if he isn't already there
if ! getent group gdm >/dev/null; then
        addgroup --system gdm
fi

# creating gdm user if he isn't already there
if ! getent passwd gdm >/dev/null; then
        adduser --system --ingroup gdm --home /var/lib/gdm gdm
        usermod -c "Gnome Display Manager" gdm
        usermod -d "/var/lib/gdm"          gdm
        usermod -g "gdm"                   gdm
        usermod -s "/bin/false"            gdm
fi

# Creating nopasswdlogin group if he isn't already there.
# That enables the password-less login feature in the users-admin
# tool of the gnome-system-tools for users that belong to it,
# and which is working thanks to GDM's PAM policy.
if ! getent group nopasswdlogin >/dev/null; then
        addgroup --system nopasswdlogin
fi

if [ -d /var/lib/gdm ]; then
  chown gdm:gdm /var/lib/gdm
  chown -R gdm:gdm /var/lib/gdm/.gconf*
  chmod 0750 /var/lib/gdm
fi

# debconf is not a registry, so we only fiddle with the default file if it
# does not exist
if [ ! -e $DEFAULT_DISPLAY_MANAGER_FILE ]; then
  if db_get shared/default-x-display-manager; then
    # workaround debconf passthru bug (#379198)
    if [ -z "$RET" ]; then
      $RET="$THIS_PACKAGE"
    fi
    if [ "$THIS_PACKAGE" != "$RET" ]; then
      echo "Please be sure to run \"dpkg --configure $RET\"."
    fi
    if db_get "$RET"/daemon_name; then
      echo "$RET" > $DEFAULT_DISPLAY_MANAGER_FILE
    fi
  fi
fi
# debconf hangs if gdm gets started below without this
db_stop || true

PID=$(status "gdm" 2>/dev/null | awk '/[0-9]$/ { print $NF }')
[ -z "$PID" ] || kill -HUP $PID

if dpkg-maintscript-helper supports rm_conffile 2>/dev/null; then
    dpkg-maintscript-helper rm_conffile /etc/X11/Xsession.d/60xdg_path-on-session 3.0.4-0ubuntu4 -- "$@"
fi

# Automatically added by dh_installinit
update-rc.d -f gdm remove >/dev/null || exit $?
# End automatically added section


exit 0