WSOD blank installation page

Your software
PHP version is* : 7.3.19
MariaDB version is 10.3.23
OS: Debian 10
Web server: nginx 1.14.2

Updating/Installing Errors/Steps followed
Installation from git (repository download)
Composer install
Chown www-data and chmod 755 on mautic folder
Via Browser /installer : white page but mautic logo displays (error 500); no log

These errors are showing in the installer :

These errors are showing in the Mautic log :
-no file created-

These errors are showing in the upgrade_log.txt file (located in the root of your Mautic instance when an upgrade has been attempted - ensure you remove or redact any sensitive data such as domain names in the file path) :
no file

*** errors in virtualmin log ***
/public_html/mautic/vendor/monolog/monolog/src/Monolog/Handler/RotatingFileHandler.php(120): Monolog\Handler\StreamHandler->write(Array)
#1 /public_html/mautic/vendor/monolog/monolog/src/Monolog/Handler/AbstractProcessingHandler.php(39): Monolog\Handler\RotatingFileHandler->write(Array)
#2 /public_html/mautic/vendor/monolog/monolog/src/Monolog/Logger.php(344): Monolog\Handler\AbstractProcessingHandler->handle(Array)
#3 /public_html/mautic/vendor/monolog/monolog/src/Monolog/Logger.php(740): Monolog\Logger->addRecord(500, ‘Uncaught PHP Ex…’, A…PHP message: PHP Fatal error: Uncaught UnexpectedValueException: The stream or file “/public_html/mautic/app/…/var/logs/mautic_prod-2020-09-15.php” could not be opened in append mode: failed to open stream: Permission denied in /public_html/mautic/vendor/monolog/monolog/src/Monolog/Handler/StreamHandler.php:110

Your problem
Cannot access install steps in the browser

Solved with a chmod 775 on mautic folder