我遵循了getting started guide Android/Linux.
我try 使用react-native run-android在ubuntu下启动react native，但失败了，出现了以下错误:
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:compileDebugJavaWithJavac'.
> Could not find tools.jar
我该怎么修？
完整输出:
$ react-native run-android
Starting JS server...
/bin/sh: 1: adb: not found
Building and installing the app on the device (cd android && ./gradlew installDebug...
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72301Library UP-TO-DATE
:app:prepareComAndroidSupportRecyclerviewV72301Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42321Library UP-TO-DATE
:app:prepareComFacebookFrescoDrawee0110Library UP-TO-DATE
:app:prepareComFacebookFrescoFbcore0110Library UP-TO-DATE
:app:prepareComFacebookFrescoFresco0110Library UP-TO-DATE
:app:prepareComFacebookFrescoImagepipeline0110Library UP-TO-DATE
:app:prepareComFacebookFrescoImagepipelineBase0110Library UP-TO-DATE
:app:prepareComFacebookFrescoImagepipelineOkhttp30110Library UP-TO-DATE
:app:prepareComFacebookReactReactNative0361Library UP-TO-DATE
:app:prepareComFacebookSoloaderSoloader010Library UP-TO-DATE
:app:prepareOrgWebkitAndroidJscR174650Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:bundleDebugJsAndAssets SKIPPED
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:processDebugJavaRes UP-TO-DATE
:app:compileDebugJavaWithJavac FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:compileDebugJavaWithJavac'.
> Could not find tools.jar
跑echo $JAVA_HOME等于/usr/lib/jvm/java-8-openjdk-amd64