Laravel 5 permission denied when writing in log file

Question

I have Ubuntu and Laravel 5 framework and I see the white screen in the browser.
When I change storage/logs directory permissions it helps, but I have to do

Answer 1

I got the same error. By using the following command I could solve it. For some reason, it is not about the log file.

sudo chgrp -R www-data storage bootstrap/cache
sudo chmod -R ug+rwx storage bootstrap/cache