由于导入错误，go竞赛检测器无法运行。 ports runtime / race：在GOROOT或GOPATH中找不到软件包“ runtime / race”

my os is ubuntu18.04.
my go compiler is gccgo.
GOROOT is /usr/local/go
it is report as:
package testmain imports runtime/race: cannot find package "runtime/race" in any of:
/usr/local/go/src/runtime/race (from $GOROOT)
/home/lzx/tiny_distributed_system/src/runtime/race (from $GOPATH)