Build etc geth on Ubuntu 20 & install golang 1.21.13

sudo apt remove golang-go sudo rm -rf /usr/local/go wget https://go.dev/dl/go1.21.13.linux-amd64.tar.gz sudo tar -C /usr/local -xzf go1.21.13.linux-amd64.tar.gz export PATH=$PATH:/usr/local/go/bin go version git clone https://github.com/etclabscore/core-geth.git cd core-geth make geth ./build/bin/geth version