Debian 9 Apache 2 MariaDb PHP 7.0.33 installed composer installed laravel globally
Attempted to update to PHP 7.2 by… sudo apt update sudo apt install php7.2 but get error unable to locate package
the Arr.php file is in \vendor\laravel\framework\src\Illuminate\Support
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Indeed I believe that this is due to the PHP version, can you confirm your current PHP version?
You could try following the steps here on how to install PHP 7.2 on Debain: https://linuxhostsupport.com/blog/how-to-install-php-7-2-on-debian-9/
Hope that this helps! Bobby