“包_ / home / vitaly：无法识别的导入路径“ _ / home / vitaly”（导入路径不是以主机名开头）”

Running go get -u returns:

package _/home/vitaly: unrecognized import path "_/home/vitaly" (import path does not begin with hostname)

I tried to reinstall golang - nothing changed.

/home/vitaly is my $HOME.

Output of go env:

GOARCH="386"
GOBIN=""
GOCACHE="/home/vitaly/.cache/go-build"
GOEXE=""
GOHOSTARCH="386"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/vitaly/.gopath"
GORACE=""
GOROOT="/usr/lib/go-1.10"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go-1.10/pkg/tool/linux_386"
GCCGO="gccgo"
GO386="387"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m32 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build014652388=/tmp/go-build -gno-record-gcc-switches"

Ubuntu 18.04.3 LTS with all updates, 386 system (32 bits).

Sorry, again my inattention: in order to update all packages we need to run go get -u all.