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Subject:	Re: Two computers running cygwin; on one python venv sets up fine and
	on the other an error
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From:	Doug Henderson via Cygwin <cygwin AT cygwin DOT com>
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On Sun, Jun 28, 2026 at 11:51 AM Andrey Repin via Cygwin <cygwin AT cygwin DOT com>
wrote:

> Greetings, Soren!
>
> > Hello Cygwinstas,
>
> > As in the Subject: I have two systems with Windows 11 and with Cygwin
> > installed. I am attempting to reproduce the execution of a series of
> steps
> > leading to meson being installed on the second computer, so I can do some
> > code building. I've tried it multiple times and keep getting this failure
> > message:
>
> > $ type -p python3 && python3 --version
> > /usr/bin/python3
> > Python 3.12.12
> > $ python3 -m venv ~/Devel/python.venv/beleriand
> > Error: Command
> > '['/cygdrive/c/Users/soren/Devel/python.venv/beleriand/bin/python', '-m',
> > 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit
> status 1.
>
> Most commonly, this means something wrong in the base system behavior.
> Check the `mount` output, try `rebase-trigger full` and make sure no Cygwin
> processes are running when you run setup.exe afterward.
>
> > On the first system, where the virtual env works fine, I see this:
>
> > $ type -p python3 && python3 --version
> > /usr/bin/python3
> > Python 3.12.12
>
> > It's the same version of python, yep. What could be wrong? TIA.


Two things come to mind.

* Check that your alternates configurations are identical on both systems.

* check that you are not attempting (directly or indirectly) to use pip to
upgrade a package which is provide by a python package installed using the
Cygwin setup.exe app. If pip is not installed, you will need to use the
Cygwin setup installer for pip. Try using "python -m venv --without-pip
VENV"

BTW: It is not clear what the current directory is when you run the error
command. Was that the complete error message? Was there not also a
traceback, possibly with messages before the traceback?

HTH
Doug

-- 
Doug Henderson, Calgary, Alberta, Canada - from gmail.com

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