Update python core16 sad :(

.github/workflows/armhf_lxd.yaml

@@ -14,14 +14,21 @@ jobs:
             snapcraft_channel: "8.x"
             runner_os: "ubuntu-22.04"
           - series: "series18"
-            snapcraft_channel: "6.x"
+            snapcraft_channel: "5.x"
             runner_os: "ubuntu-22.04"
           - snapcraft_channel: "4.x"
             series: "series16"
             runner_os: "ubuntu-20.04"
     runs-on: ${{ matrix.runner_os }}
     name: "Build: ${{ matrix.series }} (Snapcraft ${{ matrix.snapcraft_channel }})"
     steps:
+      - name: Ubuntu 18.04 upgrade Python
+        if: matrix.runner_os == "ubuntu-18.04"
+        run: |
+          sudo add-apt-repository ppa:deadsnakes/ppa
+          sudo apt -y update
+          sudo apt install -y -qq python3.10
+          sudo update-alternatives  --set python /usr/bin/python3.10
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0