I'm trying to make a fresh install of Magento 2.4.0. I want to say in advance I didn't have any problem at all in installing Magento 2.3.5 with PHP 7.3.20. Anyway…

Here's my config:

• Debian 10
• Apache 2.4.38
• PHP 7.4.8
• MariaDB 10.4.13
• Composer 1.10.10

The installation process

1. I tried either method: by uploading all files directly and by using Composer:

   composer create-project --repository-url=https://repo.magento.com/ magento/project-community-edition magento
   

2. After that, I set the permissions:

   chmod 775 -R /var/www/magento && chown -R www-data:www-data /var/www/magento && cd /var/www/magento && find . var generated vendor pub/static pub/media app/etc app/code app/design -type f -exec chmod g+w {} + && find var generated vendor pub/static pub/media app/etc app/code app/design -type d -exec chmod g+ws {} + && chown -R :www-data . && chmod u+x bin/magento
   

3. Then I run the installation command:

   magento setup:install --base-url=https://dev.example.com --db-host=localhost --db-name=magento --db-user=magento --db-password=mypassoword --admin-firstname=admin --admin-lastname=admin --admin-email=myuser@gmail.com --admin-user=admin --admin-password=mypassword --language=en_US --currency=USD --timezone=Europe/Rome --use-rewrites=1
   

   and I received some errors:

   Module 'Magento_ComposerRootUpdatePlugin':
   Installing data... Reading /<magento_root>/composer.json
   Loading config file /<magento_root>/composer.json
   Failed to initialize global composer: Composer could not find the config file: /<magento_root>/var/composer_home/composer.json
   To initialize a project, please create a composer.json file as described in the https://getcomposer.org/ "Getting Started" section
   

4. Then I tried to reach the frontend and I got this error:

   An error has happened during application run. See exception log for details.
   

   And this is the var/log/exception.log

   main.CRITICAL: Class Magento\Framework\App\Http\Interceptor does not exist {"exception":"[object] (ReflectionException(code: -1): Class Magento\\Framework\\App\\Http\\Interceptor does not exist at /var/www/magento/vendor/magento/framework/Code/Reader/ClassReader.php:26)"} []
   

What I tried

• I tried to recompile, flush the cache, deploy…
• I replaced MariaDB 10.4.13 with Mysql 8.0.21…

Any ideas?