"The Office SharePoint Server Standard Web application features feature must be activated" on Windows Server 2008 R2

When I was installing a brand new demo environment using Microsoft's latest and greatest platforms (Windows Server 2008 R2 and SQL Server 2008) I ran into an annoying issue related to SharePoint. The slipstreamed installation (including SP2) went fine, but when I tried to create a new Collaboration Portal or Publishing Portal I got the error: "The Office SharePoint Server Standard Web application features feature must be activated at the web application level before this feature can be activated.".

After some searching I learned that MOSS SP2 was not correctly applied, re-installing MOSS SP2 solved the issue. Apparently this is a known issue which can be avoided by adding the Web Server Role before running the slipstreamed SharePoint installation.

Related posts:

• Error trying to activate Publishing Infrastructure (on Technet)
  
• Add Web Server role before installing SharePoint (blog post)