Failed to install or refresh a snap: 'flutter' does not exist

snapcraft
1

Getting the following error while building the flutter snap, getting this locally and while building on the remote servers

Failed to install or refresh a snap: 'flutter' does not exist or is not available on the desired channel 'latest/stable'. Use `snap info flutter` to get a list of channels the snap is available on.
Build failed
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/lpbuildd/target/build_snap.py", line 230, in run
    self.pull()
  File "/usr/lib/python3/dist-packages/lpbuildd/target/build_snap.py", line 196, in pull
    env=env)
  File "/usr/lib/python3/dist-packages/lpbuildd/target/build_snap.py", line 100, in run_build_command
    return self.backend.run(args, env=full_env, **kwargs)
  File "/usr/lib/python3/dist-packages/lpbuildd/target/lxd.py", line 537, in run
    subprocess.check_call(cmd, **kwargs)
  File "/usr/lib/python3.6/subprocess.py", line 311, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['lxc', 'exec', 'lp-bionic-armhf', '--env', 'LANG=C.UTF-8', '--env', 'SHELL=/bin/sh', '--env', 'SNAPCRAFT_LOCAL_SOURCES=1', '--env', 'SNAPCRAFT_SETUP_CORE=1', '--env', 'SNAPCRAFT_BUILD_INFO=1', '--env', 'SNAPCRAFT_IMAGE_INFO={"build-request-id": "lp-65007640", "build-request-timestamp": "2021-07-23T10:02:48Z", "build_url": "https://launchpad.net/~build.snapcraft.io/+snap/a49962441bf969e139d2944fe1e91c08/+build/1473478"}', '--env', 'SNAPCRAFT_BUILD_ENVIRONMENT=host', '--env', 'http_proxy=http://10.10.10.1:8222/', '--env', 'https_proxy=http://10.10.10.1:8222/', '--env', 'GIT_PROXY_COMMAND=/usr/local/bin/snap-git-proxy', '--', '/bin/sh', '-c', 'cd /build/cybear-jinni && linux32 snapcraft pull']' returned non-zero exit status 2.
Revoking proxy token...
RUN: /usr/share/launchpad-buildd/bin/in-target scan-for-processes --backend=lxd --series=bionic --arch=armhf SNAPBUILD-1473478
Scanning for processes to kill in build SNAPBUILD-1473478

snapcraft.yaml content

name: cybear-jinni
version: '1.0'
summary: App to control your smart device through CyBear Jinni Hub
description: Single app to control smart device from different form factor through CyBear Jinni Hub

confinement: devmode

base: core18

parts:
  cybear-jinni:
    plugin: flutter
    source: https://github.com/CyBear-Jinni/CBJ_App.git
    flutter-target: lib/main.dart
    override-build: |
      flutter pub get
      flutter pub run build_runner build --delete-conflicting-outputs
      snapcraftctl build

apps:
  cybear-jinni:
    command: cybear_jinni
    extensions: [flutter-dev]
2

You are currently configured to build on all architectures. At the moment flutter only works on amd64 and arm64, so you should configure the builder to restrict to those. This is done by adding the following to your yaml:

architectures:
  - build-on: amd64
  - build-on: arm64
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