Appveyor: build Ubuntu release for 20.04 only

.appveyor.yml

@@ -19,9 +19,6 @@ environment:
       # CMAKE_CUSTOM_OPTIONS: "-DENABLE_EXTERNAL_LIBRARIES=OFF"
       CMAKE_CUSTOM_OPTIONS: "-DFORCE_SSE41=ON -DQT_MISSING=OFF -DDEBUG_OUTPUT=ON -DENABLE_MIRISDR=OFF -DENABLE_SERVER=OFF"
       CMAKE_GENERATOR: "Visual Studio 15 2017 Win64"
-    - TARGET: ubuntu1804prod
-      APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu1804
-      CMAKE_CUSTOM_OPTIONS: "-DFORCE_SSE41=ON -DDEBUG_OUTPUT=ON -DENABLE_EXTERNAL_LIBRARIES=ON"
     - TARGET: ubuntu2004prod
       APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
       CMAKE_CUSTOM_OPTIONS: "-DFORCE_SSE41=ON -DDEBUG_OUTPUT=ON -DENABLE_EXTERNAL_LIBRARIES=ON"
@@ -58,57 +55,6 @@ for:
       on:
         APPVEYOR_REPO_TAG: true   # deploy on tag push only
         branch: master            # release from master branch only
-  - matrix:
-      only:
-        - APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu1804
-    cache:
-      - $HOME/external/
-    install:
-      - sh: sudo apt-get update
-      # not sdrplay with soapysdr; libairspyhf-dev is too old (no lna)
-      - sh: |
-          sudo apt-get -y install build-essential cmake git \
-            devscripts fakeroot debhelper libfftw3-dev qtbase5-dev libqt5opengl5-dev \
-            qttools5-dev qttools5-dev-tools qtmultimedia5-dev libqt5multimedia5-plugins libqt5websockets5-dev \
-            libusb-1.0-0-dev libboost-all-dev libasound2-dev libopencv-dev libopencv-imgcodecs-dev \
-            libxml2-dev bison flex ffmpeg  libpostproc-dev libavcodec-dev libavformat-dev \
-            libopus-dev libcodec2-dev libairspy-dev libhackrf-dev \
-            libbladerf-dev libsoapysdr-dev libiio-dev \
-            autoconf automake libtool
-      - sh: if [[ ! "${CMAKE_CUSTOM_OPTIONS}" =~ "ENABLE_EXTERNAL_LIBRARIES=ON" ]]; then bash cmake/ci/build_cm256cc.sh; fi
-      - sh: if [[ ! "${CMAKE_CUSTOM_OPTIONS}" =~ "ENABLE_EXTERNAL_LIBRARIES=ON" ]]; then bash cmake/ci/build_mbelib.sh; fi
-      - sh: if [[ ! "${CMAKE_CUSTOM_OPTIONS}" =~ "ENABLE_EXTERNAL_LIBRARIES=ON" ]]; then bash cmake/ci/build_serialdv.sh; fi
-      - sh: if [[ ! "${CMAKE_CUSTOM_OPTIONS}" =~ "ENABLE_EXTERNAL_LIBRARIES=ON" ]]; then bash cmake/ci/build_dsdcc.sh; fi
-      - sh: if [[ ! "${CMAKE_CUSTOM_OPTIONS}" =~ "ENABLE_EXTERNAL_LIBRARIES=ON" ]]; then bash cmake/ci/build_perseus-sdr.sh; fi
-      - sh: if [[ ! "${CMAKE_CUSTOM_OPTIONS}" =~ "ENABLE_EXTERNAL_LIBRARIES=ON" ]]; then bash cmake/ci/build_xtrx-sdr.sh; fi
-      - sh: if [[ ! "${CMAKE_CUSTOM_OPTIONS}" =~ "ENABLE_EXTERNAL_LIBRARIES=ON" ]]; then bash cmake/ci/build_airspyhf.sh; fi
-      - sh: if [[ ! "${CMAKE_CUSTOM_OPTIONS}" =~ "ENABLE_EXTERNAL_LIBRARIES=ON" ]]; then bash cmake/ci/build_rtlsdr.sh; fi
-      - sh: if [[ ! "${CMAKE_CUSTOM_OPTIONS}" =~ "ENABLE_EXTERNAL_LIBRARIES=ON" ]]; then bash cmake/ci/build_limesuite.sh; fi
-    before_build:
-      - sh: bash -c export
-      - sh: bash -c pwd
-    build_script:
-      - sh: bash cmake/ci/build_sdrangel.sh
-    test_script:
-      # debian build path
-      - sh: ./obj-x86_64-linux-gnu/sdrangelbench
-    after_build:
-      - sh: mkdir sdrangel-${APPVEYOR_BUILD_VERSION}
-      - sh: cp ../*.deb ../*.build ../*.buildinfo ../*.changes sdrangel-${APPVEYOR_BUILD_VERSION}
-      - sh: tar -czf sdrangel-${APPVEYOR_BUILD_VERSION}.tar.gz sdrangel-${APPVEYOR_BUILD_VERSION}
-      - sh: appveyor PushArtifact sdrangel-${APPVEYOR_BUILD_VERSION}.tar.gz -DeploymentName archive
-    deploy:
-      release: sdrangel-v$(appveyor_build_version)
-      description: 'SDRangel Ubuntu 18.04'
-      provider: GitHub
-      auth_token:
-        secure: kyU5TaXRoily6q/QLRLqal2xCFGWEdnb8AJIu7FknsUQyj1wjRGmqC2My+Wfszod
-      artifact: archive
-      draft: false
-      prerelease: false
-      on:
-        APPVEYOR_REPO_TAG: true        # deploy on tag push only
-        branch: master                 # release from master branch only
   - matrix:
       only:
         - APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004