try this

Author: jacobwilliams

.github/workflows/CI.yml

@@ -49,19 +49,16 @@ jobs:
     - name: Install GFortran Linux
       if: contains( matrix.os, 'ubuntu')
       run: |
-        sudo add-apt-repository ppa:ubuntu-toolchain-r/test
-        sudo apt-get update
-        sudo apt-get install -y gcc-${GCC_V} gfortran-${GCC_V}
         sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-${GCC_V} 100 \
         --slave /usr/bin/gfortran gfortran /usr/bin/gfortran-${GCC_V} \
-        --slave /usr/bingcov gcov /usr/bin/gcov-${GCC_V}
+        --slave /usr/bin/gcov gcov /usr/bin/gcov-${GCC_V}
 
     - name: Compile_with_build_mkdocs
       if: matrix.gcc_v == 7
       run: |
-        GFORTRAN=gfortran-${{matrix.gcc_v}}
-        GCOV=gcov-${{matrix.gcc_v}}
-        alias gcov=$GCOV
+        # GFORTRAN=gfortran-${{matrix.gcc_v}}
+        # GCOV=gcov-${{matrix.gcc_v}}
+        # alias gcov=$GCOV
         gfortran --version
         gcov --version
         # build with build.sh, make documentation, run unit tests