Install ipsec-tools and racoon into ltsp image.
It is enough for us if any version of (every) package is installed.
Install nautilus-dropbox-dist so that we have a working
and reliable dropbox installation.
Disable /etc/webmenu/menu.json for now.
Remove /etc/webmenu/config.json as well, so that
webmenu works properly.
Make sure that guest login is not the default login at lightdm
login screen, provide the generic login prompt instead.
Do not exclude /var/lib/lightdm stuff at image build time.