Unexpected module path

[Asya-kawai]

Unable to fetch golang/lint because of unexpected module path error.

go get -u golang.org/x/oauth2/google
...
go: finding github.com/golang/lint latest
go: github.com/golang/lint@v0.0.0-20190313153728-d0100b6bd8b3: parsing go.mod: unexpected module path "golang.org/x/lint"
go get: error loading module requirements

Same issue is here.
golang/lint#436

My go-lang version

go version go1.12.1 linux/amd64

[Asya-kawai]

go version 1.11.6 also occurred.

[Asya-kawai]

I got success, I input go get command without -u as below.

go get golang.org/x/oauth2/google

Thank you.