Simply replace the Base URL with this :
http://127.0.0.1/
Another solution is to add a line in your hosts file (/private/etc/hosts/private/etc/hosts
for OSX users, /etc/hosts for Unix/Linux/etc/hosts for Unix/Linux
users) such as:
172.27.0.1 test.magento.com
and then to use the corresponding URL while installation:
Base URL = http://test.magento.comhttp://test.magento.com