Installation permissions problem
I have just installed CiviCRM 5.0.2 for Drupal, on a new clean install of Drupal 7.59. It failed saying that I needed the 'administer site administration' permission. I logged out and in again (as site admin), and also gave myself the permission as an Authorised User, but it still failed.
I managed to install it by commenting out lines 268 to 273 in the install script, and it seems to be working Ok.