Update ci.yml

Author: vboutrou

.github/workflows/ci.yml

@@ -34,10 +34,11 @@ jobs:
           echo "DISPLAY=:99" >> $GITHUB_ENV
 
       # Install gstreamer
-      # - name: Install gstreamer
-        # if: ${{ always() }}
-        # run: |
-          # sudo apt-get install  --no-install-recommends -y libgstreamer1.0-0 gstreamer1.0-tools gstreamer1.0-libav gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly
+      - name: Install gstreamer
+        if: ${{ always() }}
+        run: |
+          sudo apt-get update
+          sudo apt-get install  --no-install-recommends -y libgstreamer1.0-0 gstreamer1.0-tools gstreamer1.0-libav gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly
 
       
       # Sets up MATLAB