Hello everyone. I too had this same problem
I did a clean install and then got the message that I did have sufficient permissions so I
1. hand typed in the direct URL (not a virutal one) to the upgrade.php.
is
DOMAIN.COM/home/username/public_html/VIRUALBLOGDOMAIN/wp-admin/upgrade.php
2. this caused me to have a blank page so I typed the direct URL again to domain.com/home/username/publichtml/blogURL/wp-admin
at which point i got the main dash. and then everything worked
