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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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
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