Installing ipykernel results in error

[kieferrm]

Testing microsoft/vscode-jupyter#6821

1. create a dev container off https://github.com/microsoft/vscode-remote-try-python
2. create untitled notebook with python code cells
3. select Python 3.9 kernel
4. run cells
5. follow the prompt to install ipykernel
   ->

$ /usr/local/bin/python /home/vscode/.vscode-server-insiders/extensions/ms-python.python-2021.7.1060902895/pythonFiles/shell_exec.py /usr/local/bin/python -m pip install -U ipykernel --user /tmp/tmp-4090QrK3GXIexwoZ.log
Executing command in shell >> /usr/local/bin/python -m pip install -U ipykernel --user
ERROR: Can not combine '--user' and '--target'
Traceback (most recent call last):
  File "/home/vscode/.vscode-server-insiders/extensions/ms-python.python-2021.7.1060902895/pythonFiles/shell_exec.py", line 26, in <module>
    subprocess.check_call(shell_args, stdout=sys.stdout, stderr=sys.stderr)
  File "/usr/local/lib/python3.9/subprocess.py", line 373, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/usr/local/bin/python', '-m', 'pip', 'install', '-U', 'ipykernel', '--user']' returned non-zero exit status 1.

When I removed the --user then I got it to work.

[DonJayamanne]

Hmm, some windows users are also running into this #16844 (comment)
& whats interesting is the fact that the -u flag doesn't exist.

[DonJayamanne]

This is easy to repro, just create a Python Dev (docker) container & try to install ipykernel, the command fails.
Python extension adds the --user flag and this causes the installation to fall over.
You can replicate this easily in the terminal

[brettcannon]

My guess is the dev container ships with a pip config file which is specifying --target. I'll worry about how potentially difficult/messy dealing this will be until we know for sure that's the cause.

[karrtikr]

Not able to reproduce it anymore with standard Python3 devcontainer, seems it was automatically solved.

If you're still able to repro let me know and I'll reopen the issue.