我想开始学习Flutter，所以我遵循了guide，但我已经卡在了第一步。除了创建一个全新的应用程序之外，我没有做任何事情，但是当我在Android Studio中点击“运行”时，我得到以下错误：

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
> Failed to install the following Android SDK packages as some licences have not been accepted.
     build-tools;28.0.3 Android SDK Build-Tools 28.0.3
     platforms;android-28 Android SDK Platform 28
  To build this project, accept the SDK license agreements and install the missing components using the Android Studio SDK Manager.
  Alternatively, to transfer the license agreements from one workstation to another, see http://d.android.com/r/studio-ui/export-licenses.html

  Using Android SDK: /home/greg/Android/Sdk

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
Finished with error: Gradle task assembleDebug failed with exit code 1

看看有类似问题的人，最常见的解决方案似乎是运行yes | ~/Android/tools/bin/sdkmanager --licenses，但我没有名为sdkmanager的文件夹或文件。我的整个文档树实际上是不同的，尽管我刚刚经历了Ubuntu的官方Android Studio下载过程。对于我的文档结构，我有

~/Android/Sdk/$ ls
build-tools  patcher    platform-tools  sources
emulator     platforms  skins

其中没有一个包含工具、bin或sdkmanager。
我还在Android Studio中打开了SDK管理器，并转到SDK Tools选项卡，更新了Build-Tools并接受了许可证，然后退出并重新打开Android Studio，但我得到了相同的错误。我找不到与我具有相同文件结构的任何人。有人知道我能做什么吗？

编辑

我开始认为真实的的问题是我的Android文件夹的内容。当我运行flutter doctor时，我得到以下消息

[✓] Flutter (Channel stable, v1.12.13+hotfix.8, on Linux, locale en_US.UTF-8)
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    ✗ Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit
      https://flutter.dev/setup/#android-setup for detailed instructions.
[!] Android Studio (version 3.6)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
[✓] IntelliJ IDEA Community Edition (version 2019.3)
[!] Connected device
    ! No devices available

! Doctor found issues in 3 categories.

但是当我运行flutter doctor --android-licences时，我得到以下错误消息：

Android sdkmanager tool not found (/home/greg/Android/Sdk/tools/bin/sdkmanager).
Try re-installing or updating your Android SDK,
visit https://flutter.dev/setup/#android-setup for detailed instructions.

事实上，我没有一个工具文件夹，或者bin，或者sdkmanager。我尝试卸载并重新安装Android Studio，但没有任何变化。我下载了一个不正确的包还是什么？我是直接从https：//developer.android.com/studio/#downloads下载的，怎么可能内容看起来不正确呢？我有100 GB的可用空间，所以空间限制并没有阻止它被安装。我也没有任何网络问题。