Two permissions issues during Docker install

[vincebel7]

During Docker installation (after following these steps), I came across two different permissions-related issues after clicking "Begin Installation" on the setup.php page.

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Issue 1: Page displays error: Error opening output file. (This should never happen, we should have caught this before we got here)

Fix: docker exec into the resourcespace container and change perms: chmod 666 /var/www/html/include/config.php

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Issue 2: Blank screen, and MySQL access denied error:

[Fri Sep 05 12:29:11.305824 2025] [php:error] [pid 18] [client 172.21.0.1:44412] PHP Fatal error:  Uncaught mysqli_sql_exception: Access denied for user 'resourcespace_rw'@'172.21.0.3' (using password: YES) in /var/www/html/pages/setup.php:539\nStack trace:\n#0 /var/www/html/pages/setup.php(539): mysqli_connect()\n#1 {main}\n  thrown in /var/www/html/pages/setup.php on line 539, referer: http://localhost/pages/setup.php

Fix: docker exec into the mariadb container and change perms:

GRANT ALL PRIVILEGES ON resourcespace.* TO 'resourcespace_rw'@'%' IDENTIFIED BY 'your_password';
FLUSH PRIVILEGES;

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I ran into both issues on fresh installs on two different machines. I was able to get both installed+working after applying the two above fixes.

[puiuodragos-ux]

I have an issue with the blank screen after presing the Begin Installation button.
I tried those fixes but it won't work for me...

[Jannibunny]

I had the same issue, i've also needed to change the owner of config.php "chown root:root /var/www/html/include/config.php".
Weirdly it was the only file in the directory owned by the user ubuntu.