sudo echo $PATH

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/lubuntu/Tools/android-sdk-linux/platform-tools

adb存在于/ home / lubuntu / Tools / android-sdk-linux / platform-tools中

然后我执行了adb start-server：

* daemon not running. starting it now on port 5037 *
* daemon started successfully *

然后sudo adb install test.apk

sudo: adb: command not found

我在环境变量$PATH中添加了adb,但是sudo找不到它.
为什么？