python - How to solve 'cannot install both pin-1-1 and pin-1-1'? - Stack Overflow

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While installing VisPy in a miniconda environment:

> conda install vispy

Channels:
 - conda-forge
 - defaults
Platform: win-64
Collecting package metadata (repodata.json): done
Solving environment: \ warning  libmamba Problem type not implemented SOLVER_RULE_STRICT_REPO_PRIORITY
failed

LibMambaUnsatisfiableError: Encountered problems while solving:
  - cannot install both pin-1-1 and pin-1-1

Could not solve for environment specs
The following packages are incompatible
└─ pin-1 is installable with the potential options
   ├─ pin-1 1, which can be installed;
   └─ pin-1 1 conflicts with any installable versions previously reported.

Pins seem to be involved in the conflict. Currently pinned specs:
 - python 3.11.* (labeled as 'pin-1')

Doesn't make sense for me, but seems related to Unable to downgrade (python) if (unrelated) packages are pinned and some package needs to be removed

• what does that mean?
• how to install VisPy safely? (without altering permanently the environment)

While installing VisPy in a miniconda environment:

> conda install vispy

Channels:
 - conda-forge
 - defaults
Platform: win-64
Collecting package metadata (repodata.json): done
Solving environment: \ warning  libmamba Problem type not implemented SOLVER_RULE_STRICT_REPO_PRIORITY
failed

LibMambaUnsatisfiableError: Encountered problems while solving:
  - cannot install both pin-1-1 and pin-1-1

Could not solve for environment specs
The following packages are incompatible
└─ pin-1 is installable with the potential options
   ├─ pin-1 1, which can be installed;
   └─ pin-1 1 conflicts with any installable versions previously reported.

Pins seem to be involved in the conflict. Currently pinned specs:
 - python 3.11.* (labeled as 'pin-1')

Doesn't make sense for me, but seems related to Unable to downgrade (python) if (unrelated) packages are pinned and some package needs to be removed

• what does that mean?
• how to install VisPy safely? (without altering permanently the environment)

• python
• conda
• miniconda
• vispy

Share Improve this question Follow asked Nov 22, 2024 at 11:55 minsmins 7,4641313 gold badges6666 silver badges8585 bronze badges

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1 Answer 1

Sorted by: Reset to default 1

The pin-1 1 indicates that you have pinned a package requirement, in this case it looks like it is for python=3.11.*. Essentially a pin is a requirement that is not allowed to change in your environment.

Pins can come from a number of different sources, but my guess is that you might have a conflict from:

• the packages pinned by the file %CONDA_PREFIX%\conda-meta\pinned in your conda environment
• OR in the create_default_packages setting in your .condarc file.

How to check the pinned file:

> more %CONDA_PREFIX%\conda-meta\pinned

If this outputs Cannot access file: ...\conda-meta\pinned, then it does not exist and is not the issue.

However, if this contains a pinned python version:

python == 3.11.*

and your current environment is a different python version, this might be causing the conflict. You can manually edit the file to remove the pin.

How to check your conda config settings:

> conda config --show create_default_packages

If this returns: create_default_packages: [] then no default packages are being added.

However, if this has pinned the python version and it is different than your environment, then it might be causing the pin conflict as well. This setting can be modified via

conda config --remove create_default_packages <the pin spec>

How to override:

You can also just override the pin by adding the --no-pin flag to the conda command:

conda install vispy --no-pin

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