I have tried to install the following sample components on my local VM with well working Magento 2.0;
sample-module-form-uicomponent sample-module-newpage sample-module-servicecontract-new sample-module-webflow
from here: https://github.com/magento/magento2-samples
The installation with bin/magento setup:upgrade was successfully and the modules are avaialable in the admin panel. But if I try to open the example pages I still get "404 Not found". I used the URL from the readmes e.g. in my case 127.0.0.1/magento2/webflow/firstpage I have installed the latest version including registration.php. Developer mode is enabled, too. Same errors when I try to create custom modules. Any ideas? Thanks.