Debian Upgrade Bullseye To Bookworm

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This article contains all problems that I encountered when upgrading Debian from 11/Bullseye to 12/Bookworm.

Web Application Using PHP and MariaDB

After upgrade, PHP would not work any more. Installation of package libapache2-mod-php8.2 was required. Then the MariaDB (formerly MySQL) database could not be accessed which could be solved by installing php8.2-mysql. 

apt -y install libapache2-mod-php8.2 php8.2-mysql

It can also be that an application says "Unsupported PHP version. Required PHP >= 7.3." or similar. Maybe php-fpm is not activated in /etc/apache/conf-enabled. 

a2enconf php8.2-fpm
systemctl reload apache2
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