It produced this output:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
NGINX derivative
built by gcc 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)
built with OpenSSL 1.1.1g 21 Apr 2020
TLS SNI support enabled
configure arguments: --prefix= is not officially supported by certbot
An unexpected error occurred:
ValueError: invalid literal for int() with base 10: ‘’
Please see the logfiles in /var/log/letsencrypt for more details.
My web server is (include version):
nginx-1.16.1
The operating system my web server runs on is (include version):
Ubuntu 16.04
My hosting provider, if applicable, is:
NA
I can login to a root shell on my machine (yes or no, or I don’t know):
Yes
I’m using a control panel to manage my site (no, or provide the name and version of the control panel):
N/A
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot):
certbot 0.31.0