postinst is in xfce4-session 4.12.1-3ubuntu3.
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 16 17 18 19 | #!/bin/sh -e
if [ "$1" = configure ]; then
update-alternatives --install /usr/bin/x-session-manager \
x-session-manager /usr/bin/startxfce4 50 \
--slave /usr/share/man/man1/x-session-manager.1.gz \
x-session-manager.1.gz /usr/share/man/man1/startxfce4.1.gz
update-alternatives --install /usr/bin/x-session-manager \
x-session-manager /usr/bin/xfce4-session 40 \
--slave /usr/share/man/man1/x-session-manager.1.gz \
x-session-manager.1.gz /usr/share/man/man1/xfce4-session.1.gz
fi
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/xdg/autostart/xfce4-tips-autostart.desktop 4.8.1-4 -- "$@"
# End automatically added section
exit 0
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