I got a big problem. When I first installed Magento I got the error set
always_populate_raw_post_data to -1, which I did and it worked.
Now I am trying to install some sample data into Magento and for that, I need to install the plugin called Magento_CatalogSampleData. So when I am trying to install it I get the same error again that I got during the installation of the Magento application
always_populate_raw_post_data to -1.
I have set it to
always_populate_raw_post_data -1, both in the php.ini but also added
php_value always_populate_raw_post_data -1 in the Apache2 config. But still get the same error during the readiness check.