diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 139061c8b..985183e46 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -49,27 +49,13 @@ jobs:
           tag: ${{ github.ref }}
           
   build-ubuntu:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Checkout
         uses: actions/checkout@v3
       - name: Install dependencies
         shell: bash
-        run: sudo apt-get install libglu1-mesa-dev libxt-dev libxi-dev libglew-dev libxmu-dev zip qtbase5-dev qt5-qmake cmake
-      - name: Manually install gcc-8
-        shell: bash
-        run: |
-          sudo apt update
-          wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-8/gcc-8_8.4.0-3ubuntu2_amd64.deb
-          wget http://mirrors.edge.kernel.org/ubuntu/pool/universe/g/gcc-8/gcc-8-base_8.4.0-3ubuntu2_amd64.deb
-          wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-8/libgcc-8-dev_8.4.0-3ubuntu2_amd64.deb
-          wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-8/cpp-8_8.4.0-3ubuntu2_amd64.deb
-          wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-8/libmpx2_8.4.0-3ubuntu2_amd64.deb
-          wget http://mirrors.kernel.org/ubuntu/pool/main/i/isl/libisl22_0.22.1-1_amd64.deb
-          sudo apt install ./libisl22_0.22.1-1_amd64.deb ./libmpx2_8.4.0-3ubuntu2_amd64.deb ./cpp-8_8.4.0-3ubuntu2_amd64.deb ./libgcc-8-dev_8.4.0-3ubuntu2_amd64.deb ./gcc-8-base_8.4.0-3ubuntu2_amd64.deb ./gcc-8_8.4.0-3ubuntu2_amd64.deb
-          wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-8/libstdc++-8-dev_8.4.0-3ubuntu2_amd64.deb
-          wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-8/g++-8_8.4.0-3ubuntu2_amd64.deb
-          sudo apt install ./libstdc++-8-dev_8.4.0-3ubuntu2_amd64.deb ./g++-8_8.4.0-3ubuntu2_amd64.deb
+        run: sudo apt-get install libglu1-mesa-dev libxt-dev libxi-dev libglew-dev libxmu-dev gcc-8 g++-8 qt5-default zip
       - name: Build
         shell: bash
         run: |