Ubuntu, can not start react-native: Could not find tools.jar

I followed the getting started guide Android/Linux.

I try to start react native under ubuntu using react-native run-android, but it fails with the error:

FAILURE: Build failed with an exception.    * What went wrong:    Execution failed for task ':app:compileDebugJavaWithJavac'.> Could not find tools.jar  

How can I fix it?

Full output:

 $ 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

Running echo $JAVA_HOME gives /usr/lib/jvm/java-8-openjdk-amd64