Build Linux Error : ninja: error: 'python/lib/libpython3.so'

[joesandiroz2]

Question

why build linux error in ubuntu . how to solve ?

Code sample

import flet as ft


def main(page: ft.Page):
    counter = ft.Text("0", size=50, data=0)

    def increment_click(e):
        counter.data += 1
        counter.value = str(counter.data)
        counter.update()

    page.floating_action_button = ft.FloatingActionButton(
        icon=ft.Icons.ADD, on_click=increment_click
    )
    page.add(
        ft.SafeArea(
            ft.Container(
                counter,
                alignment=ft.alignment.center,
            ),
            expand=True,
        )
    )


ft.app(main)

Error message

root@androidSamsung:/home/buntu/webdood/fletappds/fletmain# flet build linux -v
[10:33:23] Run subprocess: ['/snap/bin/flutter', '--version', '--no-version-check',                     
           '--suppress-analytics']                                                                      
[10:33:24] Flutter executable: /snap/bin/flutter                                                        
           Dart executable: /snap/bin/dart                                                              
           Run subprocess: ['/snap/bin/dart', 'run', '--suppress-analytics', 'serious_python:main',     
           'package', '/home/buntu/webdood/fletappds/fletmain/src', '--platform', 'Linux', '-r',        
           'flet-fluid-animation @ git+https://github.com/Wanna-Pizza/flet-fluid-animation', '-r',      
           'flet==0.27.6', '--exclude', 'build', '--cleanup-packages', '--skip-site-packages']          
[10:33:25]    Woah! You appear to be trying to run flutter as root.                                     
              We strongly recommend running the flutter tool without superuser privileges.              
             /                                                                                          
           📎                                                                                           
[10:33:26] Running package command                                                                      
           Extra PyPi indexes: [https://pypi.flet.dev]                                                  
           Created temp directory: /tmp/serious_python_tempZWWJPK                                       
           Copying Python app from /home/buntu/webdood/fletappds/fletmain/src to a temp directory       
           Creating app archive at /home/buntu/webdood/fletappds/fletmain/build/flutter/app/app.zip from
           a temp directory                                                                             
[10:33:27] Writing app archive hash to                                                                  
           /home/buntu/webdood/fletappds/fletmain/build/flutter/app/app.zip.hash                        
           Deleting temp directory                                                                      
           Packaged Python app ✅                                                                       
           Found Flutter extension at                                                                   
           /home/buntu/webdood/fletappds/fletmain/build/flutter-packages/flet_fluid_animation           
           Registered Flutter user extensions ✅                                                        
           Found "icon" image at /home/buntu/webdood/fletappds/fletmain/src/assets/icon.png             
           Run subprocess: ['/snap/bin/flutter', 'build', 'linux', '--no-version-check',                
           '--suppress-analytics', '--build-name', '0.1.0']                                             
              Woah! You appear to be trying to run flutter as root.                                     
              We strongly recommend running the flutter tool without superuser privileges.              
             /                                                                                          
           📎                                                                                           
[10:33:29]                                                                                              
           Building Linux application...                                                                
           ninja: error: 'python/lib/libpython3.so', needed by                                          
           'plugins/serious_python_linux/libserious_python_linux_plugin.so', missing and no known rule  
           to make it                                                                                   
           Build process failed                                                                         
[10:33:30] <_io.TextIOWrapper name=5 encoding='utf-8'>                                                  
           Run subprocess: ['/snap/bin/flutter', 'doctor', '--no-version-check', '--suppress-analytics']
[10:33:32] Doctor summary (to see all details, run flutter doctor -v):                                  
           [✓] Flutter (Channel stable, 3.27.1, on Ubuntu 24.04.1 LTS 6.11.0-21-generic, locale         
           en_US.UTF-8)                                                                                 
           [✗] Android toolchain - develop for Android devices                                          
               ✗ cmdline-tools component is missing                                                     
                 Run `path/to/sdkmanager --install "cmdline-tools;latest"`                              
                 See https://developer.android.com/studio/command-line for more details.                
           [✓] Chrome - develop for the web                                                             
           [✓] Linux toolchain - develop for Linux desktop                                              
           [!] Android Studio (not installed)                                                           
           [✓] Connected device (2 available)                                                           
           [✓] Network resources                                                                        
                                                                                                        
           ! Doctor found issues in 2 categories.                                                       
                                                                                                        
╭──────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ Error building Flet app - see the log of failed command above.                                       │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────╯
root@androidSamsung:/home/buntu/webdood/fletappds/fletmain#

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• I have searched for answers to my question both in the issues and in previous discussions.