diff --git a/src/VirtualMonoRepo/source-mappings-ub.json b/src/VirtualMonoRepo/source-mappings-ub.json
deleted file mode 100644
index 9cf9812e2..000000000
--- a/src/VirtualMonoRepo/source-mappings-ub.json
+++ /dev/null
@@ -1,192 +0,0 @@
-// This file configures where the VMR synchronizes the sources from.
-// Each development repository has a mapping record which says where the remote repo is,
-// what files are in/excluded from the sync, etc.
-//
-// This file does not contain information about what version of sources is synchronized.
-// Please check the source-manifest.json file for that purpose.
-//
-// More details on this file's mechanics:
-// https://github.com/dotnet/arcade/blob/main/Documentation/UnifiedBuild/VMR-Design-And-Operation.md#repository-source-mappings
-{
-    // Location within the VMR where the source-build patches are stored
-    // These patches are applied on top of the code synchronized into the VMR
-    "patchesPath": "src/installer/src/SourceBuild/patches",
-
-    "sourceMappingsPath": "src/installer/src/VirtualMonoRepo/source-mappings-ub.json",
-
-    // Some files are copied outside of the src/ directory into other locations
-    // When files in the source paths are changed, they are automatically synchronized too
-    "additionalMappings": [
-        {
-            "source": "src/installer/src/SourceBuild/content",
-            "destination": ""
-        },
-        {
-            "source": "src/installer/eng/common",
-            "destination": "eng/common"
-        },
-        {
-            "source": "src/installer/src/VirtualMonoRepo/source-mappings-ub.json",
-            "destination": "src"
-        }
-    ],
-
-    // These defaults are added to all mappings unless `ignoreDefaults: true` is specified
-    // When no "include" filter is specified, "**/*" is used
-    // The default filters do not apply to submodules
-    // Only filters which start with submodule's path are applied when syncing submodules
-    "defaults": {
-        "defaultRef": "main",
-        "exclude": []
-    },
-
-    // Each of these mappings has a corresponding folder in the src/ directory
-    "mappings": [
-        {
-            "name": "arcade",
-            "defaultRemote": "https://github.com/dotnet/arcade"
-        },
-        {
-            "name": "aspire",
-            "defaultRemote": "https://github.com/dotnet/aspire",
-            "exclude": [
-                "src/Aspire.Dashboard/**/*"
-            ]
-        },
-        {
-            "name": "aspnetcore",
-            "defaultRemote": "https://github.com/dotnet/aspnetcore"
-        },
-        {
-            "name": "cecil",
-            "defaultRemote": "https://github.com/dotnet/cecil"
-        },
-        {
-            "name": "command-line-api",
-            "defaultRemote": "https://github.com/dotnet/command-line-api"
-        },
-        {
-            "name": "deployment-tools",
-            "defaultRemote": "https://github.com/dotnet/deployment-tools"
-        },
-        {
-            "name": "diagnostics",
-            "defaultRemote": "https://github.com/dotnet/diagnostics"
-        },
-        {
-            "name": "emsdk",
-            "defaultRemote": "https://github.com/dotnet/emsdk"
-        },
-        {
-            "name": "fsharp",
-            "defaultRemote": "https://github.com/dotnet/fsharp"
-        },
-        {
-            "name": "installer",
-            "defaultRemote": "https://github.com/dotnet/installer",
-            "exclude": [
-                // We don't need the tarball content in the VMR again, it's already copied in the root
-                "src/SourceBuild/content/**/*"
-            ]
-        },
-        {
-            "name": "msbuild",
-            "defaultRemote": "https://github.com/dotnet/msbuild"
-        },
-        {
-            "name": "nuget-client",
-            "defaultRemote": "https://github.com/NuGet/NuGet.Client",
-            "defaultRef": "dev"
-        },
-        {
-            "name": "razor",
-            "defaultRemote": "https://github.com/dotnet/razor"
-        },
-        {
-            "name": "roslyn",
-            "defaultRemote": "https://github.com/dotnet/roslyn"
-        },
-        {
-            "name": "roslyn-analyzers",
-            "defaultRemote": "https://github.com/dotnet/roslyn-analyzers"
-        },
-        {
-            "name": "runtime",
-            "defaultRemote": "https://github.com/dotnet/runtime"
-        },
-        {
-            "name": "scenario-tests",
-            "defaultRemote": "https://github.com/dotnet/scenario-tests"
-        },
-        {
-            "name": "sdk",
-            "defaultRemote": "https://github.com/dotnet/sdk"
-        },
-        {
-            "name": "source-build-externals",
-            "defaultRemote": "https://github.com/dotnet/source-build-externals",
-            "exclude": [
-                "src/application-insights/**/*.exe",
-                "src/application-insights/**/*.dll",
-                "src/application-insights/**/*.zip",
-                "src/application-insights/**/NuGet.config",
-                "src/humanizer/samples/**/*.js",
-                "src/newtonsoft-json/**/NuGet.Config",
-                "src/spectre-console/docs/**",
-                "src/spectre-console/NuGet.Config",
-                "src/spectre-console/examples/Console/Canvas/Mandelbrot.cs",
-                "src/xunit/NuGet.Config"
-            ]
-        },
-        {
-            "name": "source-build-reference-packages",
-            "defaultRemote": "https://github.com/dotnet/source-build-reference-packages"
-        },
-        {
-            "name": "sourcelink",
-            "defaultRemote": "https://github.com/dotnet/sourcelink"
-        },
-        {
-            "name": "symreader",
-            "defaultRemote": "https://github.com/dotnet/symreader"
-        },
-        {
-            "name": "templating",
-            "defaultRemote": "https://github.com/dotnet/templating"
-        },
-        {
-            "name": "test-templates",
-            "defaultRemote": "https://github.com/dotnet/test-templates"
-        },
-        {
-            "name": "vstest",
-            "defaultRemote": "https://github.com/microsoft/vstest"
-        },
-        {
-            "name": "xdt",
-            "defaultRemote": "https://github.com/dotnet/xdt"
-        },
-        {
-            // TODO: Remove the xliff-tasks mapping once the synchronization flags it as unused
-            // We no longer synchronize it but we can't remove it yet until
-            // it disappears from all of the Version.Details.xml files.
-            // https://github.com/dotnet/installer/issues/17661
-            "name": "xliff-tasks",
-            "defaultRemote": "https://github.com/dotnet/xliff-tasks",
-            "ignoreDefaults": true,
-            "exclude": [ "**/*" ]
-        },
-        {
-            "name": "winforms",
-            "defaultRemote": "https://github.com/dotnet/winforms"
-        },
-        {
-            "name": "wpf",
-            "defaultRemote": "https://github.com/dotnet/wpf"
-        },
-        {
-            "name": "windowsdesktop",
-            "defaultRemote": "https://github.com/dotnet/windowsdesktop"
-        }
-    ]
-}