Looks like during your upgrade a certificate went awry, but this isn't an NGINX issue, it's the maintenance of your system on your end.
From the journalctl data: Jun 04 14:21:05 heliopolis-aws nginx[44002]: nginx: [emerg] cannot load certificate "/etc/ssl/certs/heliosd.crt": BIO_new_file() failed (SSL: error:80000002:system library::No such file or directory:calling fopen(/etc/ssl/certs/heliosd.crt, r) error:10000080:BIO routines::no such file) Jun 04 14:21:05 heliopolis-aws nginx[44002]: nginx: configuration file /etc/nginx/nginx.conf test failed The required certificate file is missing and can't be found. ** Changed in: nginx (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1977667 Title: package nginx-core 1.18.0-6ubuntu14.1 failed to install/upgrade: installed nginx-core package post-installation script subprocess returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nginx/+bug/1977667/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs