Found an unexpected solution to the problem:
sudo gedit /etc/apache2/apache2.conf (or open file manually in your editor)
Change below code
From:
<Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
</Directory>
TO:
<Directory "/var/www/html">
Options Indexes FollowSymLinks
AllowOverride All
Require all granted
</Directory>
Then restart apache2 by following command
sudo service apache2 restart