diff --git a/appveyor.yml b/appveyor.yml
index 926c93a873..f75d5dfd24 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -21,8 +21,9 @@ for:
   # build and run tests
   build_script:
   - uname -a
-  - mono --version
-  - ./build.sh
+  # - mono --version
+  # - ./build.sh
+  - docker run --rm -i -v "$APPVEYOR_BUILD_FOLDER":/project ubuntu:18.04 /project/build.sh
 
   # upload test results
   after_build:
diff --git a/build.sh b/build.sh
index 930bb4b77e..f629a850cc 100755
--- a/build.sh
+++ b/build.sh
@@ -14,6 +14,35 @@
 # limitations under the License.
 # ****************************************************************************
 
+set -ex
+
+# Install Mono:
+apt-get update
+DEBIAN_FRONTEND=noninteractive apt-get -y install gnupg ca-certificates
+apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
+echo "deb https://download.mono-project.com/repo/ubuntu stable-bionic/snapshots/6.0.0.319 main" | tee /etc/apt/sources.list.d/mono-official-stable.list
+apt update
+DEBIAN_FRONTEND=noninteractive apt -y install mono-devel=6.0.0.*
+
+# Install .NET Core SDK:
+DEBIAN_FRONTEND=noninteractive apt-get -y install software-properties-common wget
+wget https://packages.microsoft.com/config/ubuntu/18.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
+dpkg -i packages-microsoft-prod.deb
+add-apt-repository universe
+apt-get update
+DEBIAN_FRONTEND=noninteractive apt-get -y install apt-transport-https
+DEBIAN_FRONTEND=noninteractive apt-get -y install dotnet-sdk-3.1
+
+# Install .NET Core 1.1 runtime:
+apt-get update
+DEBIAN_FRONTEND=noninteractive apt-get -y install libunwind-dev
+cd /usr/share/dotnet
+wget https://download.visualstudio.microsoft.com/download/pr/d3bbce9c-a15e-4224-a271-064546459e53/694a1c880d7140c80215acb5dceab3db/dotnet-ubuntu.18.04-x64.1.1.13.tar.gz -O dotnet-ubuntu.18.04-x64.1.1.13.tar.gz
+tar xvzf dotnet-ubuntu.18.04-x64.1.1.13.tar.gz
+
+
+cd /project
+
 DOTNETPATH=$(which dotnet)
 if [ ! -f "$DOTNETPATH" ]; then
 	echo "Please install Microsoft/netcore from: https://www.microsoft.com/net/core"