How to fix Error: laravel.log could not be opened?

To fix this issue, you need to change the ownership of the directory to the unix user that the webserver uses.

1. Get out of the VM
2. Using the console, go to your synced folder (vagrant)
3. sudo chown -R $USER:www-data storage
4. chmod -R 775 storage

Even though I created the project within the VM using the VM user, the folder belonged to the user in the real computer; so, when trying to

Now it's working.

Thanks to all those that helped me figure this thing out

EDIT:

Actually, it still wasn't working, it still gave me a "permission denied" problem.

Here's what I did, I modified my Vagrantfile like this:

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