message: add "sudo apt update" to the ci-ubuntu.yml.
diff: @@ -19,7 +19,7 @@ jobs:
  - uses: actions/checkout@v2
  - name: Install libraries
  - run: sudo apt install libgl-dev libxcursor-dev libxi-dev libxinerama-dev libxrandr-dev
  + run: sudo apt update && sudo apt install libgl-dev libxcursor-dev libxi-dev libxinerama-dev libxrandr-dev
  - name: Update Submodules
  run: git submodule update --init --recursive
  