public_html/storage/logs/laravel.log" could not be opened in append mode: failed to open stream: Permission denied code example

Example 1: storage/logs/laravel.log" could not be opened: failed to open stream: Permission denied

$ chmod -R 775 storage bootstrap/cache

Example 2: laravel.log" could not be opened in append mode

config.vm.synced_folder "./app","/var/www/", create:true,
:owner => "vagrant",
:group => "www-data",
:mount_options => ["dmode=775","fmode=664"]