PHP Versions for Horde 6 Horde 6 requires PHP 8.1 or PHP 8.2 versions. Support for PHP 8.3 is in development. Ubuntu and Debian Install following packages: sudo apt-get install composer sudo apt-get install php-xml sudo apt-get install php-curl sudo apt-get install php-ldap sudo apt-get install php-bcmath sudo apt-get install php-mysql PHP Extensions - PHAR extension is required for composer and other utilities - gettext for localisation - intl - iconv - PDO and SQL Database extensions - curl for API requests Depending on installed Horde applications and used backends, other extensions are required. For a fairly complete reference, the groupware container image currently uses these PHP extensions: - php-apcu - php-bcmath - php-bz2 - php-ctype - php-calendar - php-curl - php-dom - php-gd - php-iconv - php-imagick - php-intl - php-ldap - php-mbstring - php-mysql - php-opcache - php-pdo - php-phar - php-posix - php-redis - php-soap - php-sockets - php-sqlite3 - php-tokenizer - php-xmlwriter - php-xmlreader - php-zip Composer will tell user whenever a platform requirement is missing.