Install GCC 8.1.0 on Ubuntu 18.x

how-to-install-latest-gcc-on-ubuntu-lts.txt

These commands are based on ivanmara555's comment on gist https://gist.github.com/application2000/73fd6f4bf1be6600a2cf9f56315a2d91

sudo apt-get update -y && 
sudo apt-get upgrade -y && 
sudo apt-get dist-upgrade -y && 
sudo apt-get install build-essential software-properties-common -y && 
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && 
sudo apt-get update -y && 
sudo apt-get install gcc-8 g++-8 -y && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-8 && 
sudo update-alternatives --config gcc