Install Golang 1.9:
wget https://storage.googleapis.com/golang/go1.9.linux-armv6l.tar.gz
sudo tar -C /usr/local -xzf go1.9.linux-armv6l.tar.gz
export PATH=$PATH:/usr/local/go/bin # put into ~/.profile
If already installed old golang with apt-get:
sudo apt remove golang
sudo apt-get autoremove
source .profile
Test:
go version