1. Download the latest (or desired) Go version

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wget https://storage.googleapis.com/golang/go1.9.linux-amd64.tar.gz

2. Remove old installation

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sudo rm -rf /usr/local/go

3. Extract archive into /usr/local/go

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sudo tar -C /usr/local -xzf go-archive-filename.tar.gz

4. Test if everything is OK

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go version