Fing latest go version and install it.

go-upgrade.sh

echo "Getting latest Go version."
goarch="$(wget -qO- https://golang.org/dl/ | grep -oP 'go([0-9\.]+)\.linux-amd64\.tar\.gz' | head -n 1 )"
echo "Downloading latest Go for AMD64: ${goarch}"
wget --quiet --continue --show-progress "https://golang.org/dl/${goarch}"
sudo rm -rf /usr/local/go
sudo tar -C /usr/local -xzf $goarch
rm $goarch
unset goarch
go version

#if [ -d "/usr/local/go" ] ; then
#    export GOROOT=/usr/local/go
#    export GOPATH=/usr/src/go
#    export PATH=$PATH:$GOROOT/bin
#    export CGO_ENABLE=0
#    #export $GOOS=linux
#    #export $GOARCH=amd64
# else
#export PATH
#fi