Fix build

azure-pipelines.yml

@@ -3,6 +3,10 @@ jobs:
     pool:
       vmImage: 'Ubuntu 16.04'
     steps:
+    - bash: |
+        sudo apt-get install liblttng-ust-dev -y
+      displayName: 'Install dependency packages'
+
     - bash: |
         mkdir deps
         cd deps
@@ -16,7 +20,7 @@ jobs:
         ./configure --disable-debug-info --disable-man-pages
         make
         sudo make install
-      displayName: 'Telemetry Service: Install babeltrace'
+      displayName: 'Install babeltrace'
 
     - task: CMake@1
       displayName: 'CMake Configure+Generate'