diff --git a/.github/workflows/linux_ci.yml b/.github/workflows/linux_ci.yml
index ca813870..d9d16153 100644
--- a/.github/workflows/linux_ci.yml
+++ b/.github/workflows/linux_ci.yml
@@ -8,44 +8,45 @@ on:
 
 jobs:
 
-  # compile with oldest gcc4.9 which supports (most of)C++14
-  build-gcc49:
+  # Disable gcc4.9 and gcc5 since its too obsolete and failed to do apt-get
+  ## compile with oldest gcc4.9 which supports (most of)C++14
+  #build-gcc49:
 
-    runs-on: ubuntu-latest
-    name: Build with gcc 4.9 
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v1
-      - name: CmakeAndBuild
-        run: |
-            sudo apt-add-repository -y 'deb http://dk.archive.ubuntu.com/ubuntu/ xenial main'
-            sudo apt-add-repository -y 'deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe'
-            sudo apt-get update
-            sudo apt-get install -y build-essential
-            sudo apt-get install -y gcc-4.9 g++-4.9 gcc-4.9-multilib
-            ./scripts/bootstrap-gcc-49.sh
-            cd build-gcc49
-            make VERBOSE=1
+  #  runs-on: ubuntu-latest
+  #  name: Build with gcc 4.9 
+  #  steps:
+  #    - name: Checkout
+  #      uses: actions/checkout@v1
+  #    - name: CmakeAndBuild
+  #      run: |
+  #          sudo apt-add-repository -y 'deb http://dk.archive.ubuntu.com/ubuntu/ xenial main'
+  #          sudo apt-add-repository -y 'deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe'
+  #          sudo apt-get update
+  #          sudo apt-get install -y build-essential
+  #          sudo apt-get install -y gcc-4.9 g++-4.9 gcc-4.9-multilib
+  #          ./scripts/bootstrap-gcc-49.sh
+  #          cd build-gcc49
+  #          make VERBOSE=1
 
-  # compile with older gcc5
-  build-gcc5:
+  ## compile with older gcc5
+  #build-gcc5:
 
-    runs-on: ubuntu-latest
-    name: Build with gcc 5
+  #  runs-on: ubuntu-latest
+  #  name: Build with gcc 5
 
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v1
-      - name: CmakeAndBuild
-        run: |
-            sudo apt-add-repository -y 'deb http://dk.archive.ubuntu.com/ubuntu/ xenial main'
-            sudo apt-add-repository -y 'deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe'
-            sudo apt-get update
-            sudo apt-get install -y build-essential
-            sudo apt-get install -y gcc-5 g++-5
-            ./scripts/bootstrap-gcc-5.sh
-            cd build-gcc5
-            make VERBOSE=1
+  #  steps:
+  #    - name: Checkout
+  #      uses: actions/checkout@v1
+  #    - name: CmakeAndBuild
+  #      run: |
+  #          sudo apt-add-repository -y 'deb http://dk.archive.ubuntu.com/ubuntu/ xenial main'
+  #          sudo apt-add-repository -y 'deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe'
+  #          sudo apt-get update
+  #          sudo apt-get install -y build-essential
+  #          sudo apt-get install -y gcc-5 g++-5
+  #          ./scripts/bootstrap-gcc-5.sh
+  #          cd build-gcc5
+  #          make VERBOSE=1
 
   # Cross-compile for aarch64 linux target
   build-cross-aarch64:
@@ -60,7 +61,7 @@ jobs:
         run: |
             sudo apt-get update
             sudo apt-get install -y build-essential
-            sudo apt-get install -y gcc-8-aarch64-linux-gnu g++-8-aarch64-linux-gnu
+            sudo apt-get install -y gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
             ./scripts/bootstrap-gcc-aarch64-cross.sh
             cd build-cross
             make VERBOSE=1
diff --git a/cmake/aarch64-linux-gnu.toolchain b/cmake/aarch64-linux-gnu.toolchain
index b4c878a6..cdcdaf25 100644
--- a/cmake/aarch64-linux-gnu.toolchain
+++ b/cmake/aarch64-linux-gnu.toolchain
@@ -5,8 +5,8 @@ set(CMAKE_C_COMPILER_TARGET aarch64-linux-gnu)
 set(CMAKE_FIND_ROOT_PATH /usr/aarch64-linux-gnu/)
 
 # Sync with GitHub Actions config
-set(CMAKE_C_COMPILER aarch64-linux-gnu-gcc-8)
-set(CMAKE_CXX_COMPILER aarch64-linux-gnu-g++-8)
+set(CMAKE_C_COMPILER aarch64-linux-gnu-gcc)
+set(CMAKE_CXX_COMPILER aarch64-linux-gnu-g++)
 
 set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
 set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)