/etc/selinux/ is in selinux-policy-ubuntu 0.2.20091117-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/etc/selinux/ubuntu/
/etc/selinux/ubuntu/contexts/
/etc/selinux/ubuntu/contexts/customizable_types
/etc/selinux/ubuntu/contexts/dbus_contexts
/etc/selinux/ubuntu/contexts/default_contexts
/etc/selinux/ubuntu/contexts/default_type
/etc/selinux/ubuntu/contexts/failsafe_context
/etc/selinux/ubuntu/contexts/files/
/etc/selinux/ubuntu/contexts/files/media
/etc/selinux/ubuntu/contexts/initrc_context
/etc/selinux/ubuntu/contexts/removable_context
/etc/selinux/ubuntu/contexts/securetty_types
/etc/selinux/ubuntu/contexts/userhelper_context
/etc/selinux/ubuntu/contexts/users/
/etc/selinux/ubuntu/contexts/users/guest_u
/etc/selinux/ubuntu/contexts/users/root
/etc/selinux/ubuntu/contexts/users/staff_u
/etc/selinux/ubuntu/contexts/users/unconfined_u
/etc/selinux/ubuntu/contexts/users/user_u
/etc/selinux/ubuntu/contexts/users/xguest_u
/etc/selinux/ubuntu/contexts/x_contexts
/etc/selinux/ubuntu/modules/
/etc/selinux/ubuntu/policy/