Upgrade to Ubuntu 24.04 and gen 2 (#4)

Author: Chris Roper

releases/R2025b/README.md

@@ -21,7 +21,7 @@ Provide values for parameters in the custom deployment template on the Azure Por
 | **Subscription**            | Choose an Azure subscription to use for purchasing resources.<p><em>Example:</em> `VERTHAM Dev`</p>|
 | **Resource group**          | Choose a name for the resource group that will hold the resources. <p><em>Example:</em> `Saveros`</p>|
 | **Region**                | Choose the region to start resources in. Ensure that you select a location which supports your requested instance types. To check which services are supported in each location, see [Azure Region Services](<https://azure.microsoft.com/en-gb/regions/services/>). <p><em>Example:</em> `East US`</p> |
-| **Server VM Instance Size** | Specify the size of the VM you plan on using for deployment. Each MATLAB Web App Server instance runs on a VM and each instance will run multiple workers. We recommend you choose a VM size where the number of cores on your VM matches the number of MATLAB workers per VM you plan on using. The template defaults to: `Standard_D4_v3`. This configuration has 4 vCPUs and 16 GiB of Memory. For more information, see Azure [documentation](https://docs.microsoft.com/en-us/azure/virtual-machines/windows/sizes-general). <p><em>Example:</em> `Standard_D4_v3`</p> |
+| **Server VM Instance Size** | Specify the size of the VM you plan on using for deployment. Each MATLAB Web App Server instance runs on a VM and each instance will run multiple workers. We recommend you choose a VM size where the number of cores on your VM matches the number of MATLAB workers per VM you plan on using. The template defaults to: `Standard_D4_v4`. This configuration has 4 vCPUs and 16 GiB of Memory. For more information, see Azure [documentation](https://docs.microsoft.com/en-us/azure/virtual-machines/windows/sizes-general). <p><em>Example:</em> `Standard_D4_v4`</p> |
 | **Operating System**| Choose the operating system for the server. Your options are `Windows` or `Linux`. |
 |**Deploy to New or Existing Virtual Network**|  Specify whether you want to create a `new` virtual network for your deployment or use an `existing` one. When deploying to a new virtual network, by default, the following ports are opened: 443, 22, 3389, and 27000. Depending on your security requirements, you can choose to close ports 22 and 3389 after the deployment is complete. <p><p>If you are deploying to an existing virtual network, you may need to configure the network before deployment. For details, see [How do I deploy to an existing virtual network?](/README.md?tab=readme-ov-file#how-do-i-deploy-to-an-existing-virtual-network) in the FAQ.|
 | **Name of Virtual Network Where MATLAB Web App Server Will Be Deployed** |  Specify the name of the virtual network where the server will be deployed.<ul><li>If deploying to a new virtual network, you can use the default `webapp-refarch-vnet` name or specify a new name for the virtual network.</li><li>If deploying to an existing virtual network, the name you specify must match the name of an existing virtual network.</li></ul> |

releases/release-notes.md

@@ -2,6 +2,7 @@
 
 ### R2025b
 - You can now deploy MATLAB Web App Server R2025b using the Microsoft Azure reference architecture.
+- Starting November 4 2025, Linux servers use Ubuntu 24.04 and Hyper-V generation 2 for improved performance and security.
 
 ### R2025a
 - You can now deploy MATLAB Web App Server R2025a using the Microsoft Azure reference architecture.