diff --git a/TestAssets/TestPackages/dotnet-dependency-tool-invoker/dotnet-dependency-tool-invoker.csproj b/TestAssets/TestPackages/dotnet-dependency-tool-invoker/dotnet-dependency-tool-invoker.csproj
index f625dcbe6..a6e830926 100644
--- a/TestAssets/TestPackages/dotnet-dependency-tool-invoker/dotnet-dependency-tool-invoker.csproj
+++ b/TestAssets/TestPackages/dotnet-dependency-tool-invoker/dotnet-dependency-tool-invoker.csproj
@@ -1,8 +1,9 @@
-<Project Sdk="Microsoft.NET.Sdk" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
 
   <!-- This test asset needs to import the general dir.props in order to get the SdkNugetVersion property.
       This is why it also needs to explicitly set DisableImplicitFrameworkReferences to false. -->
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
+  <Import Sdk="Microsoft.NET.Sdk" Project="Sdk.props" />
 
   <PropertyGroup>
     <VersionPrefix>1.0.0-rc</VersionPrefix>
@@ -23,4 +24,5 @@
     <PackageReference Include="System.Linq" Version="4.3.0" />
   </ItemGroup>
 
+  <Import Sdk="Microsoft.NET.Sdk" Project="Sdk.targets" />
 </Project>
diff --git a/build/BuildDefaults.props b/build/BuildDefaults.props
index d574b1789..1f26ed860 100644
--- a/build/BuildDefaults.props
+++ b/build/BuildDefaults.props
@@ -33,5 +33,6 @@
     <NoWarn>NU1701;NU5104</NoWarn>
 
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <MSBuildTreatWarningsAsErrors>true</MSBuildTreatWarningsAsErrors>
   </PropertyGroup>
 </Project>
diff --git a/build/DependencyVersions.props b/build/DependencyVersions.props
index 07e237526..048583f64 100644
--- a/build/DependencyVersions.props
+++ b/build/DependencyVersions.props
@@ -78,7 +78,7 @@
   <PropertyGroup>
     <BuildTasksFeedToolVersion>2.1.0-prerelease-02430-04</BuildTasksFeedToolVersion>
     <VersionToolsVersion>$(BuildTasksFeedToolVersion)</VersionToolsVersion>
-    <DotnetDebToolVersion>2.0.0-preview2-25331-01</DotnetDebToolVersion>
+    <DotnetDebToolVersion>2.0.0</DotnetDebToolVersion>
   </PropertyGroup>
 
 </Project>
diff --git a/build/package/Installer.DEB.proj b/build/package/Installer.DEB.proj
index 0e516f440..51de5c615 100644
--- a/build/package/Installer.DEB.proj
+++ b/build/package/Installer.DEB.proj
@@ -94,12 +94,12 @@
         UseHardlinksIfPossible="False" />
 
       <!-- Remove Shared Framework and Debian Packages -->
-      <Exec Command="sudo dpkg -r $(SdkDebianPackageName)" />
-      <Exec Command="sudo dpkg -r $(AspNetCoreSharedFxDebianPackageName)" />
-      <Exec Command="sudo dpkg -r $(SharedFxDebianPackageName)" />
-      <Exec Command="sudo dpkg -r $(HostFxrDebianPackageName)" />
-      <Exec Command="sudo dpkg -r $(HostDebianPackageName)" />
-      <Exec Command="sudo dpkg -r $(RuntimeDepsPackageName)" />
+      <Exec Command="sudo dpkg -r $(SdkDebianPackageName)" IgnoreStandardErrorWarningFormat="true"  />
+      <Exec Command="sudo dpkg -r $(AspNetCoreSharedFxDebianPackageName)" IgnoreStandardErrorWarningFormat="true" />
+      <Exec Command="sudo dpkg -r $(SharedFxDebianPackageName)" IgnoreStandardErrorWarningFormat="true" />
+      <Exec Command="sudo dpkg -r $(HostFxrDebianPackageName)" IgnoreStandardErrorWarningFormat="true" />
+      <Exec Command="sudo dpkg -r $(HostDebianPackageName)" IgnoreStandardErrorWarningFormat="true"/>
+      <Exec Command="sudo dpkg -r $(RuntimeDepsPackageName)" IgnoreStandardErrorWarningFormat="true" />
   </Target>
 
   <Target Name="TestSdkDeb"
@@ -129,12 +129,12 @@
                   ToolPath="$(DebianInstalledDirectory)" />
 
       <!-- Clean up Packages -->
-      <Exec Command="sudo dpkg -r $(SdkDebianPackageName)" />
-      <Exec Command="sudo dpkg -r $(AspNetCoreSharedFxDebianPackageName)" />
-      <Exec Command="sudo dpkg -r $(SharedFxDebianPackageName)" />
-      <Exec Command="sudo dpkg -r $(HostFxrDebianPackageName)" />
-      <Exec Command="sudo dpkg -r $(HostDebianPackageName)" />
-      <Exec Command="sudo dpkg -r $(RuntimeDepsPackageName)" />
+      <Exec Command="sudo dpkg -r $(SdkDebianPackageName)" IgnoreStandardErrorWarningFormat="true" />
+      <Exec Command="sudo dpkg -r $(AspNetCoreSharedFxDebianPackageName)" IgnoreStandardErrorWarningFormat="true" />
+      <Exec Command="sudo dpkg -r $(SharedFxDebianPackageName)" IgnoreStandardErrorWarningFormat="true"  />
+      <Exec Command="sudo dpkg -r $(HostFxrDebianPackageName)" IgnoreStandardErrorWarningFormat="true" />
+      <Exec Command="sudo dpkg -r $(HostDebianPackageName)" IgnoreStandardErrorWarningFormat="true" />
+      <Exec Command="sudo dpkg -r $(RuntimeDepsPackageName)" IgnoreStandardErrorWarningFormat="true" />
   </Target>
 
   <Target Name="PrepareDotnetDebDirectories">
@@ -174,8 +174,9 @@
   <Target Name="TestDebuild">
       <Message Text="Don't remove this" />
 
-      <!-- run Debuild -->
-      <Exec Command="/usr/bin/env debuild -h" ContinueOnError="true">
+      <!-- run Debuild  -->
+      <!-- NB: IgnoreExitCode prevents Exec from failing, but does not prevent us from retrieving the exit code. -->
+      <Exec Command="/usr/bin/env debuild -h > /dev/null 2>&amp;1" IgnoreExitCode="true">
           <Output TaskParameter="ExitCode" PropertyName="DebuildExitCode" />
       </Exec>
 
diff --git a/build/package/Installer.RPM.targets b/build/package/Installer.RPM.targets
index e6e4fa917..3a9990d62 100644
--- a/build/package/Installer.RPM.targets
+++ b/build/package/Installer.RPM.targets
@@ -196,7 +196,8 @@
   <Target Name="TestFPMTool">
 
     <!-- run FPM  -->
-    <Exec Command="fpm --help > /dev/null" ContinueOnError="True">
+    <!-- NB: IgnoreExitCode prevents Exec from failing, but does not prevent us from retrieving the exit code. -->
+    <Exec Command="fpm --help > /dev/null 2>&amp;1" IgnoreExitCode="True">
       <Output TaskParameter="ExitCode" PropertyName="FPMExitCode"/>
     </Exec>
 
diff --git a/build_projects/dotnet-cli-build/Crossgen.cs b/build_projects/dotnet-cli-build/Crossgen.cs
index 48ebdebfa..8c4d4954e 100644
--- a/build_projects/dotnet-cli-build/Crossgen.cs
+++ b/build_projects/dotnet-cli-build/Crossgen.cs
@@ -82,7 +82,38 @@ namespace Microsoft.DotNet.Build.Tasks
 
         protected override MessageImportance StandardOutputLoggingImportance
         {
-            get { return MessageImportance.High; } // or else the output doesn't get logged by default
+            // Default is low, but we want to see output at normal verbosity.
+            get { return MessageImportance.Normal; }
+        }
+
+        protected override MessageImportance StandardErrorLoggingImportance
+        {
+            // This turns stderr messages into msbuild errors below.
+            get { return MessageImportance.High; }
+        }
+
+        protected override void LogEventsFromTextOutput(string singleLine, MessageImportance messageImportance)
+        {
+            // Crossgen's error/warning formatting is inconsistent and so we do
+            // not use the "canonical error format" handling of base.
+            //
+            // Furthermore, we don't want to log crossgen warnings as msbuild
+            // warnings because we cannot prevent them and they are only
+            // occasionally formatted as something that base would recognize as
+            // a canonically formatted warning anyway.
+            //
+            // One thing that is consistent is that crossgne errors go to stderr
+            // and everything else goes to stdout. Above, we set stderr to high
+            // importance above, and stdout to normal. So we can use that here
+            // to distinguish between errors and messages.
+            if (messageImportance == MessageImportance.High)
+            {
+                Log.LogError(singleLine);
+            }
+            else
+            {
+                Log.LogMessage(messageImportance, singleLine);
+            }
         }
 
         protected override string GenerateFullPathToTool()