Magento Installation Error : set always_populate_raw_post_data to -1

Magento Installation Error :

PHP Settings Check * Need Help? PHP Documentation Your PHP Version is 5.6.30, but always_populate_raw_post_data = 0. $HTTP_RAW_POST_DATA is deprecated from PHP 5.6 onwards and will be removed in PHP 7.0. This will stop the installer from running. Please open your php.ini file and set always_populate_raw_post_data to -1. If you need more help please call your hosting provider.

Solution :
 Open .htaccess file of magento and add line php_value always_populate_raw_post_data -1 between tags <IfModule mod_php5.c> and </IfModule>

<IfModule mod_php5.c>    php_value always_populate_raw_post_data -1
</IfModule>

Now Try to install again. You should not get same error again.

Convert Text into Hexadecimal and Hexadecimal into Text on command line

Convert Text into Hexadecimal using command line :

printf "linux is awesome" | xxd

or

echo -n "linux is awesome" | od -A n -t x1

Convert Hexadecimal into Text using command line:

echo "6c 69 6e 75 78 20 69 73 20 61 77 65 73 6f 6d 65" | xxd -r -p && echo ""

No PostgreSQL clusters exist; see "man pg_createcluster"

Solution :

Run commands :

dpkg-reconfigure locales

pg_createcluster 9.3 main --start
or
pg_createcluster 9.4 main --start
or
pg_createcluster 9.5 main --start

(depends on your postgresql version.)