Not an NGINX bug. Your letsencrypt certificates are missing.
See this error in the data output:
May 21 18:37:08 Thoth nginx[21417]: 2025/05/21 18:37:08 [emerg]
21417#21417: cannot load certificate "/etc/letsencrypt/live/web-
gsjkr.ddns.net/fullchain.pem": BIO_new_file() failed (SSL:
error:80000002:system library::No such file or directory:calling
fopen(/etc/letsencrypt/live/web-gsjkr.ddns.net/fullchain.pem, r)
error:10000080:BIO routines::no such file)
** Changed in: nginx (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2111444
Title:
package nginx 1.26.3-2ubuntu1 failed to install/upgrade: installed
nginx package post-installation script subprocess returned error exit
status 1
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