Install Flutter on Ubuntu 20.04 LTS (Focal Fossa)

Ubuntu 20.04 LTS has just been released.

We need to revise the installation procedure to design, build, deploy and maintain Flutter applications.

It takes 2 to 3 hours to make it happen, including the download of the files.

Contact me if you have any question @abdelkrim

Install Flutter

download the software on https://flutter.dev/docs/get-started/install/linux

mkdir ~/app

cd ~/app

tar xf ~/Downloads/flutter_linux_v1.12.13+hotfix.9-stable.tar.xz

Add the path of flutter into the PATH echo 'export PATH=$PATH:~/app/flutter/bin' >> ~/.bashrc

Run flutter config --no-analytics if you don't want to send analytics to Google

Run flutter precache to install the dev tools locally

Run flutter doctor to check if the installation is complete

abdelkrim@:~$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.12.13+hotfix.9, on Linux, locale en_US.UTF-8)
[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
    Install Android Studio from:
    https://developer.android.com/studio/index.html
    On first launch it will assist you in installing the Android SDK
    components.
    (or visit https://flutter.dev/setup/#android-setup for detailed
    instructions).
    If the Android SDK has been installed to a custom location, set
    ANDROID_HOME to that location.
    You may also want to add it to your PATH environment variable.

[!] Android Studio (not installed)
[!] VS Code (version 1.44.2)
    ✗ Flutter extension not installed; install from
    https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[!] Connected device
    ! No devices available

! Doctor found issues in 4 categories.

Install Android Studio

install Android Studio [https://developer.android.com/studio/index.html](https://developer.android.com/studio/index.html)

Download the files : android-studio-ide-192.6392135-linux.tar.gz

tar xf ~/Downloads/android-studio-ide-192.6392135-linux.tar.gz ~/app

echo 'export PATH=$PATH:~/app/android-studio/bin' >> ~/.bashrc

source ~/.bashrc

Run Android Studio studio.sh

Install Android Studio

Install (Obsolete) Android SDK Tools (uncheck the ‘hide obsolete packages’)

Install the Linux-based systems support VM acceleration through the KVM software package

Follow the instructions for Ubuntu : https://help.ubuntu.com/community/KVM/Installation

Install the KVM software if the instruction displays a number greater than 0 egrep -c '(vmx|svm)' /proc/cpuinfo

egrep -c '(vmx|svm)' /proc/cpuinfo
**4**

Install the KVM software if the instruction displays that the KVM acceleration can be used if you booted into XEN Kernel cat /sys/hypervisor/properties/capabilities or kvm-ok

INFO: /dev/kvm exists
KVM acceleration can be used

egrep -c ' lm ' /proc/cpuinfo

egrep -c ' lm ' /proc/cpuinfo
4

uname -m

$ uname -m
x86_64

Install KVM sudo apt-get install qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils virt-manager

Google indicates that you should install those packages but it did not work on my computer sudo apt-get install qemu-kvm libvirt-bin ubuntu-vm-builder bridge-utils ia32-libs-multiarch

reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libvirt-bin is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libvirt-bin' has no installation candidate
E: Unable to locate package ubuntu-vm-builder
E: Unable to locate package ia32-libs-multiarch

• libvirt-bin provides libvirtd which you need to administer qemu and kvm instances using libvirt
• qemu-kvm (kvm in Karmic and earlier) is the backend
• ubuntu-vm-builder powerful command line tool for building virtual machines
• bridge-utils provides a bridge from your network to the virtual machines

Configure the network bridge

run ip a

run sudo nano /etc/network/interfaces

Add the following lines and save the file

auto br0
iface enp0s3 inet manual
iface br0 inet dhcp
    bridge_ports enp0s3

Add your user to the group

run whoami and look at your username or echo $LOGNAME

run sudo $LOGNAME user1 libvirt run sudo $LOGNAME user1 libvirt-qemu run sudo $LOGNAME user1 kvm

Verify the installation and run virsh list --all; the result should be empty

Id Name                 State
----------------------------------

Run ls -l /dev/kvm and check that the users are root and kvm and not root and root

crw-rw----+ 1 root kvm 10, 232 mai  1 11:37 /dev/kvm

Accept the licences

Run flutter doctor --android-licenses

Install the flutter plugin on Android studio

run studio.sh

open Configure > Plugins

Search for Flutter and install the plugin Flutter by flutter.dev

Search for Dart and install the plugin Dart by JetBrains

Install the flutter plugin on Android studio

Install the Flutter extension for VSCode

open VSCode

press F1 and type ext install Dart-Code.flutter (hint: remote the character >)

See the description of the extension: open https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

Setup the Android device

run sudo apt-get install adb

Set up the Android emulator

See https://flutter.dev/docs/get-started/install/linux#set-up-the-android-emulator

1. Launch Android Studio > Tools > Android > AVD Manager and select Create Virtual Device. (The Android submenu is only present when inside an Android project.)
2. Choose a device definition and select Next.
3. Select one or more system images for the Android versions you want to emulate, and select Next. An x86 or x86_64 image is recommended.
4. Under Emulated Performance, select Hardware — GLES 2.0 to enable hardware acceleration.
5. Verify the AVD configuration is correct, and select Finish.
6. In Android Virtual Device Manager, click Run in the toolbar. The emulator starts up and displays the default canvas for your selected OS version and device.

Set up the Android emulator

Check the installation

run flutter doctor

$ flutter doctor

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.12.13+hotfix.9, on Linux, locale en_US.UTF-8)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[✓] Android Studio (version 3.6)
[✓] VS Code (version 1.44.2)
[!] Connected device

! Doctor found issues in 1 category.

Check your phone due to the Connected device issue and authorize your computer to access the computer!

run flutter doctor and you should be ready!

[!] Connected device
    • Device 92813c9 is not authorized.
    You might need to check your device for an authorization dialog.

That’s all folks!