Drupal 8 Suddenly redirects to /core/install.php

Question

I was working on updating some contents on my website and suddenly it keeps redirect to www.example.com/core/install.php and gives me this message: "Drupal already installed" . I don't know what is the reason because it was working fine.

Answer 1

Maybe it's file permission problem. Try to set the owner of the web-root of Drupal installation:

chown -R YOUR-USER:WEBSERVER-USER .

Especially it's file permission problem of the settings.php. If the web server can't read this file, the new install process is started and redirects to /core/install.php

If it helps so you can go on with more secure file permission setting described here: https://www.drupal.org/node/244924