我已经在我的 Ubuntu 机器上正确安装了 flutter。我还安装了 Android Studio 及其插件 Flutter 和 Dart。无论如何，当我运行时：
flutter doctor --verbose
我得到这个输出：
[?] Flutter (Channel stable, 1.20.1, on Linux, locale es_ES.UTF-8)
• Flutter version 1.20.1 at /root/snap/flutter/common/flutter
• Framework revision 2ae34518b8 (hace 5 días), 2020-08-05 19:53:19 -0700
• Engine revision c8e3b94853
• Dart version 2.9.0
[?] Android toolchain - develop for Android devices (Android SDK version 30.0.1)
• Android SDK at /home/AAAA/Android/Sdk
• Platform android-30, build-tools 30.0.1
• Java binary at: /usr/bin/java
• Java version OpenJDK Runtime Environment …