Step 1
If the server is a physical computer, then insert the Windows Server 2012 Operating System Disc into the DVD drive (D: in this example)
If the server is a virtual machine, then first step is to mount a Windows Server 2012 source ISO image to the VM or insert a Windows Server 2012 DVD in the DVD drive of the host machine and attach it to the VM running Windows Server 2012 Server Core as shown below:
Step 2
At the command prompt type:
mkdir c:\mount
Issue the following command and press Enter:
dism.exe /mount-image /ImageFile:d:\sources\install.wim /Index:4 /Mountdir:c:\mount /readonly
Start Windows Powershell by typing the following command:
Powershell.exe
From the Windows Powershell prompt issue the following commands and press Enter after each:
Import-Module ServerManager
Install-WindowsFeature –IncludeAllSubFeature User-Interfaces-Infra –Source:c:\mount\windows
Step 3
When prompted, restart the server and logon as Administrator to verify the installation of the GUI components:
Shutdown /r /t 0
Verify that the GUI components appear
Step 4
To convert a Windows Server 2012 Full Installation to a Server Core Installation, open Windows Powershell and issue the following commands:
Import-Module ServerManager
Uninstall-WindowsFeature User-Interfaces-Infra
Wait for the removal to complete:
Step 5
Restart by issuing the following command:
Shutdown /r /t 5
The following screen appears:
The server restarts with Server Core features.