Installing Go on Ubuntu is pretty easy. We can do that with apt-get manager but i preffer to do it with downloading from official site.
Last version of the time of writing this is 1.5. So we can download it from https://golang.org/dl/

curl -O https://storage.googleapis.com/golang/go1.5.linux-amd64.tar.gz

After that we must unpack it into

/usr/local

tar -C /usr/local -xzf go1.5.linux-amd64.tar.gz

After that we must set some

env

variables.

mkdir -p ~/go; echo "export GOPATH=$HOME/go" >> ~/.bashrc
echo "export PATH=$PATH:$HOME/go/bin:/usr/local/go/bin" >> ~/.bashrc
source ~/.bashrc

And finally we have it:

root@golang:~# go version
go version go1.5 linux/amd64