Run apt update before running apt get install

.github/workflows/ci.yml

@@ -445,6 +445,7 @@ jobs:
 
       - name: Setup xvfb (Linux)
         run: |
+          sudo apt update
           # Stuff copied wildly from several stackoverflow posts
           sudo apt-get install -y xvfb libxkbcommon-x11-0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 libxcb-xinerama0 libxcb-xinput0 libxcb-xfixes0 libxcb-shape0 libglib2.0-0 libgl1-mesa-dev '^libxcb.*-dev' libx11-xcb-dev libglu1-mesa-dev libxrender-dev libxi-dev libxkbcommon-dev libxkbcommon-x11-dev