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