That PPA looks pretty outdated—I recommend using the one provided by nginx itself. Note, though, that none of these builds will (even the official ones) will have TLSv1.3 support as this needs the yet-to-be-released OpenSSL 1.1.1, which no current Linux distribution uses.

Recently released Ubuntu Zesty (17.04) uses OpenSSL 1.0.2, and upcoming Debian Stretch (9) release uses 1.1.0.

http://packages.ubuntu.com/zesty/openssl https://packages.debian.org/stretch/openssl

If you want to use a precompiled version from a repository, nginx has its own, which always stays up to date: http://nginx.org/en/linux_packages.html