diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index c3ee2506eb..afcd052d01 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -64,14 +64,12 @@ jobs:
       testResultsFiles: '**\*.trx'
     condition: succeededOrFailed()
 
-# Linux build does not work when we mix runtimes and 
-# we don't use the results to do anything, skipping it for now  
-# - job: Linux
-#   pool:
-#     vmImage: 'ubuntu-16.04'
-#   variables:
-#       buildConfiguration: 'Release'
-#   steps:
-#   - script: ./build.sh -c $(buildConfiguration)
-#     displayName: './build.sh -c $(buildConfiguration)'
+- job: Linux
+  pool:
+    vmImage: 'ubuntu-18.04'
+  variables:
+      buildConfiguration: 'Release'
+  steps:
+  - script: ./build.sh -c $(buildConfiguration)
+    displayName: './build.sh -c $(buildConfiguration)'
    
diff --git a/scripts/build.sh b/scripts/build.sh
index 009b5c3d82..fe0797beef 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -15,7 +15,7 @@ NOCOLOR='\033[0m'
 # Parse options
 #
 CONFIGURATION="Debug"
-TARGET_RUNTIME="ubuntu.16.04-x64"
+TARGET_RUNTIME="ubuntu.18.04-x64"
 VERSION="" # Will set this later by reading TestPlatform.Settings.targets file.
 VERSION_SUFFIX="dev"
 FAIL_FAST=false
@@ -238,7 +238,7 @@ function invoke_build()
     log ".. .. Build: Source: $TPB_Solution"
     
     # Workaround for https://github.com/dotnet/sdk/issues/335
-    export FrameworkPathOverride=$TP_PACKAGES_DIR/microsoft.targetingpack.netframework.v4.6/1.0.1/lib/net46/
+    export FrameworkPathOverride=$TP_PACKAGES_DIR/microsoft.targetingpack.netframework.v4.7.2/1.0.0/lib/net472/
     if [ -z "$PROJECT_NAME_PATTERNS" ]
     then
         if [[ $TP_USE_REPO_API = 0 ]]; then
diff --git a/src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Microsoft.TestPlatform.Extensions.BlameDataCollector.csproj b/src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Microsoft.TestPlatform.Extensions.BlameDataCollector.csproj
index 9d7a332540..f1cef62835 100644
--- a/src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Microsoft.TestPlatform.Extensions.BlameDataCollector.csproj
+++ b/src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Microsoft.TestPlatform.Extensions.BlameDataCollector.csproj
@@ -23,11 +23,18 @@
     <ProjectReference Include="..\Microsoft.TestPlatform.ObjectModel\Microsoft.TestPlatform.ObjectModel.csproj" />
     <ProjectReference Include="..\..\src\Microsoft.TestPlatform.CoreUtilities\Microsoft.TestPlatform.CoreUtilities.csproj" />
   </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
     <Reference Include="System" />
     <Reference Include="System.Runtime" />
     <Reference Include="System.Xml" />
     <Reference Include="Microsoft.CSharp" />
+    <Reference Include="netstandard" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Diagnostics.NETCore.Client">
+      <Version>0.2.0-preview.20220.1</Version>
+    </PackageReference>
+    <PackageReference Include="NETStandard.Library" Version="2.0.3" />
   </ItemGroup>
   <ItemGroup>
     <Compile Update="Resources\Resources.Designer.cs">
@@ -42,21 +49,5 @@
       <LastGenOutput>Resources.Designer.cs</LastGenOutput>
     </EmbeddedResource>
   </ItemGroup>
-  <ItemGroup>
-    <PackageReference Include="Microsoft.Diagnostics.NETCore.Client">
-      <Version>0.2.0-preview.20220.1</Version>
-    </PackageReference>
-  </ItemGroup>
-  <!-- <ItemGroup>
-    <None Update="procdump">
-      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
-    </None>
-    <None Update="procdump.exe">
-      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
-    </None>
-    <None Update="procdump64.exe">
-      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
-    </None>
-  </ItemGroup> -->
   <Import Project="$(TestPlatformRoot)scripts\build\TestPlatform.targets" />
 </Project>
diff --git a/src/package/external/external.csproj b/src/package/external/external.csproj
index 6e6bdc448c..9224602d52 100644
--- a/src/package/external/external.csproj
+++ b/src/package/external/external.csproj
@@ -4,7 +4,7 @@
   </PropertyGroup>
   <Import Project="$(TestPlatformRoot)scripts/build/TestPlatform.Settings.targets" />
   <PropertyGroup>
-    <TargetFrameworks>net46</TargetFrameworks>
+    <TargetFrameworks>net472</TargetFrameworks>
     <AssemblyName>restore</AssemblyName>
     <RuntimeIdentifier>win7-x64</RuntimeIdentifier>
     <GenerateAssemblyConfigurationAttribute>false</GenerateAssemblyConfigurationAttribute>
@@ -94,10 +94,10 @@
       <PrivateAssets>All</PrivateAssets>
     </PackageReference>
     <!-- Required for resolution of desktop dependencies in non windows environment.
-         We've to set to net46 since the net451 and other packages have assemblies in wrong case.
+         We've to set to net472 since the net451 and other packages have assemblies in wrong case.
          E.g. System.XML instead of System.Xml. -->
-    <PackageReference Include="Microsoft.TargetingPack.NETFramework.v4.6">
-      <Version>1.0.1</Version>
+    <PackageReference Include="Microsoft.TargetingPack.NETFramework.v4.7.2">
+      <Version>1.0.0</Version>
       <PrivateAssets>All</PrivateAssets>
     </PackageReference>
   </ItemGroup>
diff --git a/src/vstest.console/vstest.console.csproj b/src/vstest.console/vstest.console.csproj
index 6843aaf587..0de0c734c8 100644
--- a/src/vstest.console/vstest.console.csproj
+++ b/src/vstest.console/vstest.console.csproj
@@ -43,6 +43,7 @@
     <Reference Include="System" />
     <Reference Include="System.IO" />
     <Reference Include="System.Runtime" />
+    <Reference Include="System.Collections" />
     <Reference Include="System.Xml" />
     <Reference Include="Microsoft.CSharp" />
   </ItemGroup>
diff --git a/test/Microsoft.TestPlatform.AcceptanceTests/Microsoft.TestPlatform.AcceptanceTests.csproj b/test/Microsoft.TestPlatform.AcceptanceTests/Microsoft.TestPlatform.AcceptanceTests.csproj
index 928f62332f..dbc75999c4 100644
--- a/test/Microsoft.TestPlatform.AcceptanceTests/Microsoft.TestPlatform.AcceptanceTests.csproj
+++ b/test/Microsoft.TestPlatform.AcceptanceTests/Microsoft.TestPlatform.AcceptanceTests.csproj
@@ -35,5 +35,8 @@
     <PackageReference Include="Microsoft.Internal.CodeCoverage" Version="$(TestPlatformExternalsVersion)" />
     <PackageReference Include="System.Data.DataSetExtensions" Version="4.5.0-preview2-26406-04" />
   </ItemGroup>
+  <ItemGroup>
+    <Folder Include="TestAssets\CodeCoverageTest\" />
+  </ItemGroup>
   <Import Project="$(TestPlatformRoot)scripts\build\TestPlatform.targets" />
 </Project>
diff --git a/test/Microsoft.TestPlatform.Extensions.BlameDataCollector.UnitTests/Microsoft.TestPlatform.Extensions.BlameDataCollector.UnitTests.csproj b/test/Microsoft.TestPlatform.Extensions.BlameDataCollector.UnitTests/Microsoft.TestPlatform.Extensions.BlameDataCollector.UnitTests.csproj
index 2852753cfa..84c0db3ec3 100644
--- a/test/Microsoft.TestPlatform.Extensions.BlameDataCollector.UnitTests/Microsoft.TestPlatform.Extensions.BlameDataCollector.UnitTests.csproj
+++ b/test/Microsoft.TestPlatform.Extensions.BlameDataCollector.UnitTests/Microsoft.TestPlatform.Extensions.BlameDataCollector.UnitTests.csproj
@@ -17,12 +17,14 @@
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\src\Microsoft.TestPlatform.Extensions.BlameDataCollector\Microsoft.TestPlatform.Extensions.BlameDataCollector.csproj" />
+    <PackageReference Include="NETStandard.Library" Version="2.0.3" />
   </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
     <Reference Include="System.Runtime" />
     <Reference Include="System" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Xml" />
+    <Reference Include="netstandard" /> 
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Properties\" />
diff --git a/test/Microsoft.TestPlatform.TestHostProvider.UnitTests/Hosting/DotnetTestHostManagerTests.cs b/test/Microsoft.TestPlatform.TestHostProvider.UnitTests/Hosting/DotnetTestHostManagerTests.cs
index 2cf1a8889d..d602d8bcbb 100644
--- a/test/Microsoft.TestPlatform.TestHostProvider.UnitTests/Hosting/DotnetTestHostManagerTests.cs
+++ b/test/Microsoft.TestPlatform.TestHostProvider.UnitTests/Hosting/DotnetTestHostManagerTests.cs
@@ -492,7 +492,7 @@ public void GetTestHostProcessStartInfoOnWindowsForValidPathReturnsFullPathOfDot
             char separator = ';';
             var dotnetExeName = "dotnet.exe";
 #if !NET451
-            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            if (!System.Environment.OSVersion.Platform.ToString().StartsWith("Win"))
             {
                 separator = ':';
                 dotnetExeName = "dotnet";
@@ -519,7 +519,7 @@ public void GetTestHostProcessStartInfoShouldThrowExceptionWhenDotnetIsNotInstal
 
             char separator = ';';
             var dotnetExeName = "dotnet.exe";
-            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            if (!System.Environment.OSVersion.Platform.ToString().StartsWith("Win"))
             {
                 separator = ':';
                 dotnetExeName = "dotnet";
diff --git a/test/Microsoft.TestPlatform.TestHostProvider.UnitTests/Microsoft.TestPlatform.TestHostProvider.UnitTests.csproj b/test/Microsoft.TestPlatform.TestHostProvider.UnitTests/Microsoft.TestPlatform.TestHostProvider.UnitTests.csproj
index 6c2c1139a8..ac42301ead 100644
--- a/test/Microsoft.TestPlatform.TestHostProvider.UnitTests/Microsoft.TestPlatform.TestHostProvider.UnitTests.csproj
+++ b/test/Microsoft.TestPlatform.TestHostProvider.UnitTests/Microsoft.TestPlatform.TestHostProvider.UnitTests.csproj
@@ -8,19 +8,18 @@
   <PropertyGroup>
     <OutputType Condition=" '$(TargetFramework)' == 'netcoreapp2.1' ">Exe</OutputType>
     <AssemblyName>Microsoft.TestPlatform.TestHostProvider.UnitTests</AssemblyName>
-    <TargetFrameworks>netcoreapp2.1;net451</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.1;net472</TargetFrameworks>
     <EnableCodeAnalysis>true</EnableCodeAnalysis>
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\src\Microsoft.TestPlatform.TestHostProvider\Microsoft.TestPlatform.TestHostProvider.csproj" />
-    <ProjectReference Include="..\Microsoft.TestPlatform.Common.UnitTests\Microsoft.TestPlatform.Common.UnitTests.csproj" />
-    <ProjectReference Include="..\..\src\Microsoft.TestPlatform.PlatformAbstractions\Microsoft.TestPlatform.PlatformAbstractions.csproj" />
   </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
     <Reference Include="System.Runtime" />
     <Reference Include="System" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Xml" />
+    <Reference Include="netstandard" />
   </ItemGroup>
   <Import Project="$(TestPlatformRoot)scripts\build\TestPlatform.targets" />
 </Project>
diff --git a/test/Microsoft.TestPlatform.Utilities.UnitTests/Microsoft.TestPlatform.Utilities.UnitTests.csproj b/test/Microsoft.TestPlatform.Utilities.UnitTests/Microsoft.TestPlatform.Utilities.UnitTests.csproj
index d0c2957dff..47ac9bd9b4 100644
--- a/test/Microsoft.TestPlatform.Utilities.UnitTests/Microsoft.TestPlatform.Utilities.UnitTests.csproj
+++ b/test/Microsoft.TestPlatform.Utilities.UnitTests/Microsoft.TestPlatform.Utilities.UnitTests.csproj
@@ -23,6 +23,7 @@
     <Reference Include="System" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Xml" />
+    <Reference Include="System.Threading.Tasks" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="DefaultCodeCoverageConfig.xml" />
diff --git a/test/datacollector.PlatformTests/datacollector.PlatformTests.csproj b/test/datacollector.PlatformTests/datacollector.PlatformTests.csproj
index 9def0ed7d6..5c1834b815 100644
--- a/test/datacollector.PlatformTests/datacollector.PlatformTests.csproj
+++ b/test/datacollector.PlatformTests/datacollector.PlatformTests.csproj
@@ -19,7 +19,7 @@
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
   </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
     <Reference Include="System.Runtime" />
     <Reference Include="System" />
     <Reference Include="Microsoft.CSharp" />
diff --git a/test/datacollector.UnitTests/datacollector.UnitTests.csproj b/test/datacollector.UnitTests/datacollector.UnitTests.csproj
index 8e21bb9594..e4dd4abe91 100644
--- a/test/datacollector.UnitTests/datacollector.UnitTests.csproj
+++ b/test/datacollector.UnitTests/datacollector.UnitTests.csproj
@@ -16,7 +16,7 @@
   <ItemGroup>
     <ProjectReference Include="..\..\src\datacollector\datacollector.csproj" />
   </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
     <Reference Include="System.Runtime" />
     <Reference Include="System" />
     <Reference Include="Microsoft.CSharp" />