should we skip libstdc++6? It seems to be too old.

Author: atsushieno

.github/workflows/build-dist-with-cmake.yml

@@ -45,7 +45,7 @@ jobs:
       run: |
         echo y | sudo apt-get install xvfb wget unzip libc6 \
                  libcurl3-gnutls-dev  libfreetype6-dev libgcc1 libjpeg-dev \
-                 libpng-dev libstdc++6 libwebkit2gtk-4.1-dev libx11-6 \
+                 libpng-dev libwebkit2gtk-4.1-dev libx11-6 \
                  libxext6 zlib1g  make g++ mesa-common-dev libasound2-dev \
                  libjack-jackd2-dev ladspa-sdk doxygen \
                  graphviz cmake ninja-build

.github/workflows/build-dist-with-projucer.yml

@@ -40,7 +40,7 @@ jobs:
       run: |
         echo y | sudo apt-get install xvfb wget unzip libc6 \
                  libcurl3-gnutls-dev  libfreetype6-dev libgcc1 libjpeg-dev \
-                 libpng-dev libstdc++6 libwebkit2gtk-4.1-dev libx11-6 \
+                 libpng-dev libwebkit2gtk-4.1-dev libx11-6 \
                  libxext6 zlib1g  make g++ mesa-common-dev libasound2-dev \
                  libjack-jackd2-dev ladspa-sdk doxygen \
                  graphviz cmake ninja-build