Not able to install apps
This problem is caused by the PHP CLI and "php" command set lower than 7.2.5 version and/or disabled PHP functions in your server. It generally happens in shared hosting with cPanel, Plesk, etc. panels where they offer Multi-PHP versions and set the lowest one for CLI and/or "php" command, mostly 5.x version.
Please, ask your hosting provider to make sure that PHP CLI and php command has at least 7.2.5 version and the following PHP functions are not disabled:
You can get Akaunting installed within one-click on DigitalOcean servers and see the app installation working fine.
How to change PHP version?
If you have SSH access to your Ubuntu server, you can change the PHP version by running the following commands:
sudo update-alternatives --set php /usr/bin/php7.4 sudo update-alternatives --set phar /usr/bin/phar7.4 sudo update-alternatives --set phar.phar /usr/bin/phar.phar7.4 sudo update-alternatives --set phpize /usr/bin/phpize7.4 sudo update-alternatives --set php-config /usr/bin/php-config7.4
Keep in mind that the
/usr/bin/php7.4 path may differ on your server. Here you can learn more.
If you don't have SSH access then your hosting provider must apply the change.