Update GCC in Ubuntu
Update gcc to gcc-9 on Ubuntu
sudo apt update -y &&
sudo apt upgrade -y &&
sudo apt dist-upgrade -y &&
sudo apt install build-essential software-properties-common -y &&
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y &&
sudo apt update -y &&
sudo apt install gcc-9 g++-9 -y &&
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 60 --slave /usr/bin/g++ g++ /usr/bin/g++-9 &&
sudo update-alternatives --config gcc
Select gcc-9