Try this

Author: jrfnl

.github/workflows/publish-wiki.yml

@@ -77,6 +77,17 @@ jobs:
       # Update Wiki files.
       # ################################################################################
 
+      # Updating the lists can fail intermittently, typically after Microsoft has released a new package.
+      # This should not be blocking for this job, so ignore any errors from this step.
+      # Ref: https://github.com/dotnet/core/issues/4167
+      - name: Update the available packages list
+        continue-on-error: true
+        run: sudo apt-get update
+
+      # DiffUtils is needed for the Wiki Reporting - diff report code sample generation.
+      - name: Install diffutils
+        run: sudo apt-get install --no-install-recommends -y diffutils
+
       - name: Install DocToc table of contents generator
         run: npm install -g doctoc