我是Go的新手，我按照website和youtube video中的说明操作我在运行go build hello.go时遇到以下错误：
go: disabling cache (/home/myuser/.cache/go-build) due to initialization failure: open /home/myuser/.cache/go-build/log.txt: permission denied
# runtime
/usr/local/go/src/runtime/map.go:64:2: bucketCntBits redeclared in this block
previous declaration at /usr/local/go/src/runtime/hashmap.go:64:18
/usr/local/go/src/runtime/map.go:65:2: bucketCnt redeclared in this block
previous declaration at /usr/local/go/src/runtime/hashmap.go:65:23
/usr/local/go/src/runtime/map.go:69:2: loadFactorNum redeclared in this block
previous declaration at /usr/local/go/src/runtime/hashmap.go:69:18
/usr/local/go/src/runtime/map.go:70:2: loadFactorDen redeclared in this block
previous declaration at /usr/local/go/src/runtime/hashmap.go:70:18
/usr/local/go/src/runtime/map.go:76:2: maxKeySize redeclared in this block
previous declaration at /usr/local/go/src/runtime/hashmap.go:76:17
/usr/local/go/src/runtime/map.go:77:2: maxValueSize redeclared in this block
previous declaration at /usr/local/go/src/runtime/hashmap.go:77:17
/usr/local/go/src/runtime/map.go:82:2: dataOffset redeclared in this block
previous declaration at /usr/local/go/src/runtime/hashmap.go:85:4
/usr/local/go/src/runtime/map.go:91:2: empty redeclared in this block
previous declaration at /usr/local/go/src/runtime/hashmap.go:91:19
/usr/local/go/src/runtime/map.go:92:2: evacuatedEmpty redeclared in this block
previous declaration at /usr/local/go/src/runtime/hashmap.go:92:19
/usr/local/go/src/runtime/map.go:93:2: evacuatedX redeclared in this block
previous declaration at /usr/local/go/src/runtime/hashmap.go:93:19
/usr/local/go/src/runtime/map.go:93:2: too many errors
它写了permission denied，但我试图用sudo go build运行它，它也失败了：
sudo：go：命令未找到
我正在研究Ubuntu 16.4。我的档案hello.go在$HOME/Desktop/go/src/hello。
我的文件$HOME/myuser/.profile包含：
PATH="$HOME/bin:$HOME/.local/bin:$PATH:/usr/local/go/bin"
Gopth
The GOPATH environment variable lists places to look for Go code.
On Unix, the value is a colon-separated string. On Windows, the value
is a semicolon-separated string. On Plan 9, the value is a list.
GOPATH must be set to get, build and install packages outside the standard Go tree.
Use tool like dep to segregate your different go project, maintaining your project dependencies.
奶牛
The Go binary distributions assume they will be installed in /usr/local/go (or c:\Go under Windows), but it is possible to install
the Go tools to a different location. In this case you must set the
GOROOT environment variable to point to the directory in which it was installed.
因此，它始终倾向于使用自己的gopath来编译代码。 GOPATH适用于您自己的项目/第三方库（使用“go get”下载）。