/?q=admin not working

I just installed Drupal 8 using Drush (followed installation guidelines) and the site seems to work fine. I get a home page (probably the default one, no styling). The links like “contact” “login” etc all return 404 (i have mod_rewrite enabled on apache2).

Anyway, even /?q=admin or /?q=user do nothing (200 OK from the apache2 log file) and clean URLs all return 404.

I found nothing helpful googling this issue.

Any help?

More info:

Drupal 8.2.5
Ubuntu 16.04 LTS running under VM Workstation Player
Apache 2.4.18

Thank you,

Drupal version: 

Source: https://www.drupal.org/taxonomy/term/22/feed