try to install python2 manually to fix ci pipeline

.github/workflows/ci.yml

@@ -142,11 +142,17 @@ jobs:
       shell: bash -eo pipefail -l {0}
       run: |
         if [[ "${{ matrix.node-version }}" == 0.6* ]]; then
+          wget https://www.python.org/ftp/python/2.7.9/Python-2.7.9.tgz
+          sudo tar xzf Python-2.7.9.tgz
+          cd Python-2.7.9
+          sudo ./configure --enable-optimizations
+          sudo make altinstall
+          cd ..
           sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3B4FE6ACC0B21F32
           sudo sh -c 'echo "deb http://us.archive.ubuntu.com/ubuntu/ bionic universe" >> /etc/apt/sources.list'
           sudo sh -c 'echo "deb http://security.ubuntu.com/ubuntu bionic-security main" >> /etc/apt/sources.list'
           sudo apt-get update
-          sudo apt-get install g++-4.8 gcc-4.8 libssl1.0-dev python2 python-is-python2
+          sudo apt-get install g++-4.8 gcc-4.8 libssl1.0-dev
           export CC=/usr/bin/gcc-4.8
           export CXX=/usr/bin/g++-4.8
         fi