The CircleCI Ubuntu 14.04 build image has the following value for the GOPATH env var:
/home/ubuntu/.go_workspace:/usr/local/go_workspace
and no GOROOT env var. Is this an error?
GOROOT is the enviroment variable that specify where the go binary distribution is installed, if is installed in the default folder you are not required to declare this enviroment variable.
And, according to CIRCLE CI docs Go is installed in the default folder so you shouldn't have any problem.