Flutter の環境構築を行なっている際、Android　Studio をインストールし、
flutter doctorを実行して確認した際にエラーが出てしまう。。。

問題のエラー文

＄　fflutter doctor -v
[✓] Flutter (Channel master, 2.9.0-1.0.pre.207, on Ubuntu 20.04.3 LTS 5.10.76-linuxkit, locale en_US)
    • Flutter version 2.9.0-1.0.pre.207 at /usr/local/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 7addb91364 (10 hours ago), 2021-12-28 04:54:11 -0500
    • Engine revision 01d19ceef4
    • Dart version 2.16.0 (build 2.16.0-134.0.dev)
    • DevTools version 2.9.2

[!] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /usr/local/Android/sdk
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/linux#android-setup for more details.

[✓] Chrome - develop for the web
    • Chrome at google-chrome

[✓] Android Studio
    • Android Studio at /opt/android-studio
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)

[✓] Connected device (1 available)
    • Chrome (web) • chrome • web-javascript • Google Chrome 96.0.4664.110

[✓] HTTP Host Availability
    • All required HTTP hosts are available

$ flutter doctor --android-licenses
Android sdkmanager not found. Update to the latest Android SDK and ensure that the cmdline-tools are installed to
resolve this.

試したこと

Android SDK Command-line Tools(latest)にチェックを入れる

これでもダメ、、、

解決方法

① まずJava８をインストールかつ、適用

[!] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /usr/local/Android/sdk
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/linux#android-setup for more details.

上記にあるRun `path/to/sdkmanager --install "cmdline-tools;latest"を実行するだけでした！
実行する場所と、パスが間違っててうまくいかなかっただけでしたので、そこだけ気をつけたらうまくいきます！

結果

flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, 2.9.0-1.0.pre.207, on Ubuntu 20.04.3 LTS 5.10.76-linuxkit, locale en_US)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Chrome - develop for the web
[✓] Android Studio
[✓] Connected device (1 available)
[✓] HTTP Host Availability

• No issues found!

余談

途中でこれが原因！？と思ったのが、こちらの公式のサイトに書かれてある、Javaのバージョンについて。Java8がないとだめ、とあったのでインストールかつ反映させたのですがかわりなし、、、

スクリーンショット 2021-12-29 4.57.37

参考リンク