I am using magento 2.2.3 and php vesion is 5.6.3. After running the project It gives error "Magento supports PHP 7.0.2, 7.0.4, and 7.0.6 or later. Please read Magento System Requirements." Magento manual says that php 5.6 is a supporting version.How can I fix this issue?
Edit: The problem is that I don't want PHP 7.1 because it is not supported by a plug-in I am using. So I'd rather install 7.0.6 or some other PHP version in the 7.0.x series supported by Magento. But I am unable to install a specific version of PHP. How can I specify the exact version of PHP while installing in Ubuntu 16.04