$ sudo chmod -R gu+w storage
$ sudo chmod -R guo+w storage
$ sudo chmod -R gu+w bootstrap/cache
$ sudo chmod -R guo+w bootstrap/cache
Assign directories to server group and give both user and group read & write permissions for given folders
sudo chgrp -R www-data storage bootstrap/cache data_csv
sudo chmod -R ug+rwx storage bootstrap/cache data_csv