new go
1. sudo apt-get update 2. wget https://go.dev/dl/go1.21.0.linux-amd64.tar.gz 3. sudo tar -xvf go1.21.0.linux-amd64.tar.gz 4. sudo mv go /usr/local 5. export GOROOT=/usr/local/go 6. export GOPATH=$HOME/go 7. export PATH=$GOPATH/bin:$GOROOT/bin:$PATH 8. source ~/.profile