ubuntu:jammy postinst failure: PHP Fatal error - Symfony/Polyfill/Php80/autoload.php not found

Problem

Installation test on ubuntu:jammy fails during post-installation script with a PHP Fatal error.

Error (from Jenkins build #27)

PHP Warning:  require_once(Symfony/Polyfill/Php80/autoload.php): Failed to open stream: No such file or directory in /usr/share/php/Symfony/Component/Process/autoload.php on line 4
PHP Fatal error:  Uncaught Error: Failed opening required 'Symfony/Polyfill/Php80/autoload.php' (include_path='.:/usr/share/php') in /usr/share/php/Symfony/Component/Process/autoload.php:4
Stack trace:
#0 /usr/share/php/MultiFlexi/autoload.php(10): require_once()
#1 /usr/share/php/multiflexi-cli/autoload.php(10): require_once('...')
#2 /usr/share/multiflexi-cli/multiflexi-cli.php(19): require_once('...')
#3 {main}
  thrown in /usr/share/php/Symfony/Component/Process/autoload.php on line 4
dpkg: error processing package multiflexi-mserver (--configure):
 installed multiflexi-mserver package post-installation script subprocess returned error exit status 255

Cause

Path incompatibility: Symfony/Polyfill/Php80/autoload.php is not found at the expected include path on jammy (PHP 8.1). The php-symfony-polyfill-php80 package is installed but its autoload file is not accessible at the path expected by Symfony/Component/Process.

Fix

Investigate the autoload path mapping for php-symfony-polyfill-php80 on Ubuntu 22.04 (jammy) and adjust packaging or dependencies accordingly.

Start by reproducing Jenkins build #27 on Ubuntu 22.04 (jammy) and inspect the multiflexi-mserver post-installation script and the PHP autoload paths shown in the error. Trace how php-symfony-polyfill-php80 is packaged and included; done means the package configures successfully without the missing Symfony/Polyfill/Php80/autoload.php failure.