bbc 的 microbit 板子，其micropython代码，网址：https://github.com/bbcmicrobit/micropython
但是，按照上面的流程编译，不成功，有个地方需要注意一下，特别备注一下。
报错1：
E: Failed to fetch http://ppa.launchpad.net/pmiller-opensource/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found解决办法：
# remove the built-in package, if installed:
sudo apt-get remove binutils-arm-none-eabi gcc-arm-none-eabi
# set up the PPA for the ARM-maintained package:
sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa
sudo apt-get update
# install:
sudo apt-get install gcc-arm-embedded报错1：
pkg_resources.VersionConflict: (setuptools 20.7.0 (/usr/lib/python3/dist-packages), Requirement.parse('setuptools>=40.0'))解决办法：
pip3 install --upgrade setuptools报错2：
error: No module.json file.
error: The current directory does not contain a valid module.解决办法
$ git clone https://github.com/bbcmicrobit/micropython
$ cd micropython