I'm running Docker on Ubuntu 18 with a container for MariaDB, Nginx and php-fpm (7.3).
The PHP container has composer installed, and I used it to create a Drupal Commerce project. I can start the Drupal install process using a browser, but after I input the DB settings, the process fails and I get the following error.
An AJAX HTTP error occurred.
HTTP Result Code: 404
Debugging information follows.
StatusText: Not Found
ResponseText: File not found.
Increasing the execution time, post time, memory limit, post and upload sizes in the php.ini file, as recommended by another user, didn't solve the problem.
Nginx error log contains the following message.
[error] 6#6: *46 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream'.
The database has tables and data in it, so I know the database credentials are correct.
What am I doing wrong?