/usr/share/debhelper/autoscripts/postinst-ubuntu-defaults-desktop-session is in ubuntu-defaults-builder 0.49.
This file is owned by root:root, with mode 0o644.
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 16 17 18 | if [ "$1" = configure ] && [ -z "$2" ] && [ -r /usr/share/PACKAGE/default-session.txt ]; then
session=$(cat /usr/share/PACKAGE/default-session.txt)
# LightDM
if [ -x /usr/lib/lightdm/lightdm-set-defaults ] ; then
/usr/lib/lightdm/lightdm-set-defaults --session $session || true
fi
# gdm
if [ ! -e /etc/gdm/custom.conf ]; then
mkdir -p /etc/gdm/
cat <<EOF > /etc/gdm/custom.conf
[daemon]
DefaultSession=$session
EOF
fi
fi
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