whem i use the comand:
$ go get -u -d gocv.io/x/gocv
i get the error:
package gocv.io/x/gocv: cannot download, /home/ariel/go is a GOROOT, not a GOPATH. For more details see: 'go help gopath'
iḿ using ubuntu 18.04
It looks like you have installed the go binary into where your default GOPATH is. Either set the GOPATH to be something different, or move your installation.