Bionic is too old.

.github/workflows/main.yml

@@ -100,7 +100,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        tag: [bionic, focal, groovy]
+        tag: [focal, groovy]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
@@ -129,4 +129,4 @@ jobs:
       uses: actions/upload-artifact@v2
       with:
         name: debian-${{ matrix.tag }}
-        path: ${{ github.workspace }}/deployment/dist/*
+        path: ${{ github.workspace }}/deployment/dist/*