Install golang from source
$ wget https://dl.google.com/go/go1.15.5.linux-amd64.tar.gz
$ tar -C /usr/local -xvzf go1.15.5.linux-amd64.tar.gz
$ cat /usr/local/go/VERSION
go1.15.5
$ vim .bash_profile
PATH=$PATH:$HOME/bin:/usr/local/go/bin
export PATH
$ source .bash_profile
$ go version
go version go1.15.5 linux/amd64