Can not install Windows Internal Database (WID) - Windows Server 2012

I have been trying to install Windows Internal Database (WID) as it is required by Windows Server Update Server (WSUS) but at the end of 'Add roles and features' wizard with following error message:

The server currently holds AD CS, AD DS, DHCP, DNS and IIS roles.

Source: http://social.technet.microsoft.com/Forums/en-US/winserver8gen/thread/ae88de7d-f69f-4cb1-877f-379151d01899

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