$ /var/lib/jenkins/tools/android-sdk/tools/bin/sdkmanager --list --verbose
 [android] Installing the 'platform-tool,build-tools;30.0.0,extra-android-m2repository,extra-google-m2repository,emulator' SDK component(s)...
 $ /var/lib/jenkins/tools/android-sdk/tools/bin/sdkmanager --include_obsolete platform-tools build-tools;30.0.0 extras;android;m2repository extras;google;m2repository emulator
 Warning: Failed to find package build-tools;30.0.0
 [android] Failed to create file or directory: /var/lib/jenkins/.android
 [android] Determination of SDK root failed
 ['/var/lib/jenkins/tools/android-sdk']: Does not look like an Android SDK directory

FATAL: null
 java.lang.NullPointerException
 at hudson.plugins.android_emulator.util.Utils.getToolCommand(Utils.java:492)
 at hudson.plugins.android_emulator.util.Utils.runAndroidTool(Utils.java:537)
 at hudson.plugins.android_emulator.util.Utils.runAndroidTool(Utils.java:530)
 at hudson.plugins.android_emulator.util.Utils.runAndroidTool(Utils.java:524)
 at hudson.plugins.android_emulator.SdkInstaller.isPlatformInstalled(SdkInstaller.java:340)
 at hudson.plugins.android_emulator.SdkInstaller.installPlatform(SdkInstaller.java:284)
 at hudson.plugins.android_emulator.SdkInstaller.installDependencies(SdkInstaller.java:261)
 at hudson.plugins.android_emulator.AndroidEmulator.setUp(AndroidEmulator.java:294)
 at hudson.model.Build$BuildExecution.doRun(Build.java:157)
 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:504)
 at hudson.model.Run.execute(Run.java:1853)
 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
 at hudson.model.ResourceController.execute(ResourceController.java:97)
 at hudson.model.Executor.run(Executor.java:427)
 Finished: FAILURE