diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index e81606483b..927514e2c2 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -15,7 +15,10 @@ jobs:
   - task: UseRubyVersion@0
     inputs:
       versionSpec: '2.5.1'
-  - script: sudo apt-get build-dep ruby2.3
+  - script: |
+      set -x
+      sudo cat /etc/apt/sources.list
+      sudo apt-get build-dep ruby2.3
   - checkout: self
     fetchDepth: 10
   - script: |