Downgrade to ubuntu-18.04 (mimblewimble#562)

DavidBurkett · web-flow · commit 42a2ee030272 · 2021-01-05T08:48:52.000Z
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
@@ -30,7 +30,7 @@ variables:
 jobs:
 - job: linux
   pool:
-    vmImage: ubuntu-latest
+    vmImage: ubuntu-18.04
   strategy:
     matrix:
       config/libwallet/api:
