Wait before running apt command (#1132)

Author: ericstj

azure-pipelines-e2e-tests-template.yml

@@ -39,6 +39,20 @@ stages:
             pwsh: true
             targetType: inline
             script: |
+              $numRetry = 0
+              $maxRetry = 60*10
+
+              while($numRetry -le $maxRetry)
+              {
+                  sudo fuser -v /var/lib/dpkg/lock-frontend 2>&1
+
+                  if ($LASTEXITCODE -ne 0) { Break }
+                  
+                  sleep 1
+                  $numRetry++
+                  echo "Waited $numRetry s for release of dpkg locks"
+              }
+              
               sudo apt update
               sudo apt -y install maven
               mvn -version
@@ -169,4 +183,4 @@ stages:
           env:
             HADOOP_HOME: $(Build.BinariesDirectory)$(PATH_SEPARATOR)hadoop
             SPARK_HOME: $(Build.BinariesDirectory)$(PATH_SEPARATOR)spark-${{ test.version }}-bin-hadoop2.7
-            DOTNET_WORKER_DIR: $(CURRENT_DOTNET_WORKER_DIR)
+            DOTNET_WORKER_DIR: $(CURRENT_DOTNET_WORKER_DIR)