SNI to ALPN migration ubuntu 16.04 nginx

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Actually, something doesn't look quite right here:

# dpkg --list | grep -E "python.?-certbot"
ii  python-certbot-nginx             0.28.0-1+ubuntu16.04.1+certbot+3           all          transitional dummy package
ii  python3-certbot                  0.28.0-1+ubuntu16.04.1+certbot+4           all          main library for certbot
ii  python3-certbot-nginx            0.25.0-2+ubuntu16.04.1+certbot+1           all          Nginx plugin for Certbot```