Setup complete, but site can't start

sudo ee stack restart
PHP7.0-FPM is not installed
Restart : nginx     [OK]
Restart : php5.6-fpm[OK]
Restart : mysql     [OK]
Restart : postfix   [OK]

But still nothing...

So, about logs:

 cd /var/log/ee
-bash: cd: /var/log/ee: Permission denied

What did I do wrong? Why is there no access? How we can see the log?