I have properly configured GOPATH. But i am not able to download fabric-sdk-go.
user1@NTP-145UBUNTU:~$ go env
 GOARCH="amd64"
 GOBIN=""
 GOEXE=""
 GOHOSTARCH="amd64"
 GOHOSTOS="linux"
 GOOS="linux"
 GOPATH="/usr/lib/go-1.6/bin"
 GORACE=""
 GOROOT="/usr/lib/go-1.6"
 GOTOOLDIR="/usr/lib/go-1.6/pkg/tool/linux_amd64"
 GO15VENDOREXPERIMENT="1"
 CC="gcc"
 GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0"
 CXX="g++"
 CGO_ENABLED="1"
 user1@NTP-145UBUNTU:~$ sudo go get -u github.com/hyperledger/fabric-sdk-go
 [sudo] password for user1: 
 package github.com/hyperledger/fabric-sdk-go: cannot download, $GOPATH not set. For more details see: go help gopath
It is still saying that my GOPATH env variable is not set. Please help