Update dsvm-ubuntu-intro.md

Remove reference to Ubuntu 18

Author: jesscioffi

articles/machine-learning/data-science-virtual-machine/dsvm-ubuntu-intro.md

@@ -13,21 +13,26 @@ ms.custom: mode-other
 
 # Quickstart: Set up the Data Science Virtual Machine for Linux (Ubuntu)
 
-Get up and running with the Ubuntu 18.04 and Ubuntu 20.04 Data Science Virtual Machines.
+> [!IMPORTANT]
+> Items marked (preview) in this article are currently in public preview.
+> The preview version is provided without a service level agreement, and it's not recommended for production workloads. Certain features might not be supported or might have constrained capabilities.
+> For more information, see [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/).
+
+Get up and running with the Ubuntu 20.04 Data Science Virtual Machine and Azure DSVM for PyTorch (preview).
 
 ## Prerequisites
 
-To create an Ubuntu 18.04 or Ubuntu 20.04 Data Science Virtual Machine, you must have an Azure subscription. [Try Azure for free](https://azure.com/free).
+To create an Ubuntu 20.04 Data Science Virtual Machine or an Azure DSVM for PyTorch, you must have an Azure subscription. [Try Azure for free](https://azure.com/free).
 
 >[!NOTE]
 >Azure free accounts don't support GPU enabled virtual machine SKUs.
 
 ## Create your Data Science Virtual Machine for Linux
 
-Here are the steps to create an instance of the Data Science Virtual Machine from Ubuntu 18.04 or Ubuntu 20.04:
+Here are the steps to create an instance of the Ubuntu 20.04 Data Science Virtual Machine or the Azure DSVM for PyTorch:
 
 1. Go to the [Azure portal](https://portal.azure.com). You might be prompted to sign in to your Azure account if you're not already signed in.
-1. Find the virtual machine listing by typing in "data science virtual machine" and selecting "Data Science Virtual Machine- Ubuntu 18.04" or "Data Science Virtual Machine- Ubuntu 20.04"
+1. Find the virtual machine listing by typing in "data science virtual machine" and selecting "Data Science Virtual Machine- Ubuntu 20.04" or "Azure DSVM for PyTorch (preview)"
 
 1. On the next window, select **Create**.