do-release-upgrade我在 16.04 服务器上执行，它说
3 installed packages are no longer supported by Canonical. You can
still get support from the community.
3 packages are going to be removed. 153 new packages are going to be
installed. 500 packages are going to be upgraded.
升级之前是否可以获取不受支持和已删除的软件包列表？