I solved it by manually installing repo
from the
install manually repo
and resolve error Python 3
This answer for android build system error
For Python 3
If you get a "/usr/bin/env 'python' no such file or directory" error message, use one of the following solutions:
If your Ubuntu 20.04.2 LTS is a newly installed (vs. upgraded) Linux version:
sudo ln -s /usr/bin/python3 /usr/bin/python
f using Git version 2.19 or greater, you can specify --partial-clone when performing repo init. This makes use of Git's partial clone capability to only download Git objects when needed, instead of downloading everything. Because using partial clones means that many operations must communicate with the server, use the following if you're a developer and you're using a network with low latency:
repo init -u https://android.googlesource.com/platform/manifest -b master --partial-clone --clone-filter=blob:limit=10M
you can see document in
Downloading the Source