Sometimes when you try to run to flutter project for the first time you can come across this kind of error bellow:

Launching lib/main.dart on INE LX2 in debug mode...
Running Gradle task 'assembleDebug'...

FAILURE: Build failed with an exception.

* Where:
Build file '/home/etienne-bobo/AndroidStudioProjects/demo/android/app/build.gradle' line: 26

* What went wrong:
A problem occurred evaluating project ':app'.
> Could not resolve all artifacts for configuration 'classpath'.
   > Could not find com.android.tools.build:gradle:4.1.0.
     Searched in the following locations:
       - https://jcenter.bintray.com/com/android/tools/build/gradle/4.1.0/gradle-4.1.0.pom
     If the artifact you are trying to retrieve can be found in the repository but without metadata in 'Maven POM' format, you need to adjust the 'metadataSources { ... }' of the repository declaration.
     Required by:
         unspecified:unspecified:unspecified

* 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 6s
Exception: Gradle task assembleDebug failed with exit code 1

To solve this problem just open your flutter.gradle file (you will find it in flutter/packages/flutter_tools/gradle/flutter.gradle) and change

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.1.0'
    }
}

to

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.1.0'
    }
}

then save your file

Hope it helps you 😌😌