I'd like to write my own local webapps userscripts, but I don't want to compile and install the main webapps source code every time. 

I would like to keep the original Ubuntu Webapps package installed, but use my local userscripts as well. Is this possible?


Question: Can't deploy Sharepoint 2013 app
Answer: The message could come from the fact that you are doing a "High-Trust" SharePoint App, which requires also configuring Certificates. I would suggest you really folow to the letter these 2 posts, and also try to create a simple SharePoint Hosted, to make sure it works.


http://msdn.microsoft.com/en-us/library/fp179923.aspx
http://msdn.microsoft.com/en-us/library/fp179901.aspx


Some tips: 
 - make sure DNS is properly setup with a Wildcard domain or your local hosts file 
 - do not use sub-domains (Mirjam has an excellent article here http://sharepointchick.com/archive/2012/07/29/setting-up-your-app-domain-for-sharepoint-2013.aspx)