Question: When i try to install matplotlib 3.8.0 in my conda environment with miniconda package manager i get the following error : Solving environment: / warning libmamba Added empty dependency for problem type SOLVER_RULE_UPDATE failed LibMambaUnsatisfiableError: Encountered problems while solving: - cannot install both pin-1-1 and pin-1-1 - nothing provides numpy 1.10* needed by matplotlib-1.5.3-np110py34_1 Could not solve for environment specs The following packages are incompatible ├─ matplotlib is installable with the potential options │ ├─ matplotlib 1.5.3 would require │ │ └─ numpy 1.10* , which does not exist (perhaps a missing channel); │ ├─ matplotlib 1.5.3 would require │ │ └─ python 3.4* but there are no viable options │ │ ├─ python 3.4.5 would require │ │ │ └─ vc 10.* , which does not exist (perhaps a missing channel); │ │ └─ python 3.4.5 would require │ │ └─ vs2010_runtime, which does not exist (perhaps a missing channel); │ ├─ matplotlib 1.5.3 would require │ │ └─ pyqt 4.11.* , which requires │ │ └─ qt 4.8.* , which does not exist (perhaps a missing channel); │ ├─ matplotlib [2.0.2|2.1.0|...|2.2.4] would require │ │ └─ python >=2.7,<2.8.0a0 , which can be installed; │ ├─ matplotlib [2.0.2|2.1.0|...|3.3.4] would require │ │ └─ python >=3.6,<3.7.0a0 , which can be installed; │ ├─ matplotlib [2.1.2|2.2.2|...|3.5.3] would require │ │ └─ python >=3.7,<3.8.0a0 , which can be installed; │ ├─ matplotlib [2.2.4|3.1.1|...|3.7.3] would require │ │ └─ python >=3.8,<3.9.0a0 , which can be installed; │ ├─ matplotlib 2.2.5 would require │ │ └─ matplotlib-base >=2.2.5,<2.2.6.0a0 with the potential options │ │ ├─ matplotlib-base 2.2.5 would require │ │ │ └─ python >=2.7,<2.8.0a0 , which can be installed; │ │ ├─ matplotlib-base [2.2.5|3.2.0|...|3.3.2] would require │ │ │ └─ python >=3.6,<3.7.0a0 , which can be installed; │ │ ├─ matplotlib-base [2.2.5|3.2.0|...|3.3.2] would require │ │ │ └─ python >=3.7,<3.8.0a0 , which can be installed; │ │ ├─ matplotlib-base [2.2.5|3.2.0|...|3.3.2] would require │ │ │ └─ python >=3.8,<3.9.0a0 , which can be installed; │ │ └─ matplotlib-base [2.2.5|3.3.2] would require │ │ └─ python >=3.9,<3.10.0a0 , which can be installed; │ ├─ matplotlib [3.2.0|3.2.1|3.2.2|3.3.0|3.3.1] would require │ │ └─ matplotlib-base [>=3.2.0,<3.2.1.0a0 |>=3.2.1,<3.2.2.0a0 |>=3.2.2,<3.2.3.0a0 |>=3.3.0,<3.3.1.0a0 |>=3.3.1,<3.3.2.0a0 ], whic; │ ├─ matplotlib 3.3.2 would require │ │ └─ matplotlib-base >=3.3.2,<3.3.3.0a0 , which can be installed (as previously explained); │ ├─ matplotlib [3.3.2|3.3.3|...|3.8.0] would require │ │ └─ python >=3.9,<3.10.0a0 , which can be installed; │ ├─ matplotlib [3.4.3|3.5.0|...|3.8.0] would require │ │ └─ python >=3.10,<3.11.0a0 , which can be installed; │ ├─ matplotlib [3.6.1|3.6.2|...|3.8.0] would require │ │ └─ python >=3.11,<3.12.0a0 , which can be installed; │ └─ matplotlib [2.0.2|2.1.0|...|3.0.0] would require │ └─ python >=3.5,<3.6.0a0 , which can be installed; └─ pin-1 is not installable because there are no viable options ├─ pin-1 1 would require │ └─ python 3.12.* , which conflicts with any installable versions previously reported; └─ pin-1 1 would require └─ python 3.12.* , which conflicts with any installable versions previously reported. Pins seem to be involved in the conflict. Currently pinned specs: - python 3.12.* (labeled as 'pin-1') (datasc) C:\Users\USER>conda install matplotlib -c conda-forge Channels: - conda-forge - defaults Platform: win-64 Collecting package metadata (repodata.json): done Solving environment: \ warning libmamba Added empty dependency for problem type SOLVER_RULE_UPDATE failed LibMambaUnsatisfiableError: Encountered problems while solving: - cannot install both pin-1-1 and pin-1-1 - nothing provides numpy 1.10* needed by matplotlib-1.5.3-np110py34_1 Could not solve for environment specs The following packages are incompatible ├─ matplotlib is installable with the potential options │ ├─ matplotlib 1.5.3 would require │ │ └─ numpy 1.10* , which does not exist (perhaps a missing channel); │ ├─ matplotlib 1.5.3 would require │ │ └─ python 3.4* but there are no viable options │ │ ├─ python 3.4.5 would require │ │ │ └─ vc 10.* , which does not exist (perhaps a missing channel); │ │ └─ python 3.4.5 would require │ │ └─ vs2010_runtime, which does not exist (perhaps a missing channel); │ ├─ matplotlib 1.5.3 would require │ │ └─ pyqt 4.11.* , which requires │ │ └─ qt 4.8.* , which does not exist (perhaps a missing channel); │ ├─ matplotlib [2.0.2|2.1.0|...|2.2.4] would require │ │ └─ python >=2.7,<2.8.0a0 , which can be installed; │ ├─ matplotlib [2.0.2|2.1.0|...|3.3.4] would require │ │ └─ python >=3.6,<3.7.0a0 , which can be installed; │ ├─ matplotlib [2.1.2|2.2.2|...|3.5.3] would require │ │ └─ python >=3.7,<3.8.0a0 , which can be installed; │ ├─ matplotlib [2.2.4|3.1.1|...|3.7.3] would require │ │ └─ python >=3.8,<3.9.0a0 , which can be installed; │ ├─ matplotlib 2.2.5 would require │ │ └─ matplotlib-base >=2.2.5,<2.2.6.0a0 with the potential options │ │ ├─ matplotlib-base 2.2.5 would require │ │ │ └─ python >=2.7,<2.8.0a0 , which can be installed; │ │ ├─ matplotlib-base [2.2.5|3.2.0|...|3.3.2] would require │ │ │ └─ python >=3.6,<3.7.0a0 , which can be installed; │ │ ├─ matplotlib-base [2.2.5|3.2.0|...|3.3.2] would require │ │ │ └─ python >=3.7,<3.8.0a0 , which can be installed; │ │ ├─ matplotlib-base [2.2.5|3.2.0|...|3.3.2] would require │ │ │ └─ python >=3.8,<3.9.0a0 , which can be installed; │ │ └─ matplotlib-base [2.2.5|3.3.2] would require │ │ └─ python >=3.9,<3.10.0a0 , which can be installed; │ ├─ matplotlib [3.2.0|3.2.1|3.2.2|3.3.0|3.3.1] would require │ │ └─ matplotlib-base [>=3.2.0,<3.2.1.0a0 |>=3.2.1,<3.2.2.0a0 |>=3.2.2,<3.2.3.0a0 |>=3.3.0,<3.3.1.0a0 |>=3.3.1,<3.3.2.0a0 ], whic; │ ├─ matplotlib 3.3.2 would require │ │ └─ matplotlib-base >=3.3.2,<3.3.3.0a0 , which can be installed (as previously explained); │ ├─ matplotlib [3.3.2|3.3.3|...|3.8.0] would require │ │ └─ python >=3.9,<3.10.0a0 , which can be installed; │ ├─ matplotlib [3.4.3|3.5.0|...|3.8.0] would require │ │ └─ python >=3.10,<3.11.0a0 , which can be installed; │ ├─ matplotlib [3.6.1|3.6.2|...|3.8.0] would require │ │ └─ python >=3.11,<3.12.0a0 , which can be installed; │ └─ matplotlib [2.0.2|2.1.0|...|3.0.0] would require │ └─ python >=3.5,<3.6.0a0 , which can be installed; └─ pin-1 is not installable because there are no viable options ├─ pin-1 1 would require │ └─ python 3.12.* , which conflicts with any installable versions previously reported; └─ pin-1 1 would require └─ python 3.12.* , which conflicts with any installable versions previously reported. Pins seem to be involved in the conflict. Currently pinned specs: - python 3.12.* (labeled as 'pin-1')  I have set my solver to libmamba so that's why the message looks a bit different. Isn't there any other way rather than downgrading my python to 3.9? I'd rather use the latest version 3.12.0.

Answer: As of the writing of the question, python 3.12 is just a few days old. Days! You don't have to downgrade your python to 3.9.  It's conda. You just use another enviroronment for a python 3.9 and install whatever is needed. That's what Conda is made for. Matplotlib already works pretty fine with Python 3.11. No need to go down to 3.9 Really, it's just a few days old. Give it some time. Keep your python 3.11 environment and use it for whatever you want to use matplotlib. Keep a Python 3.12 environment for your very first steps in Python 3.12, and try to install matplotlib now and then. And at some point, matplotlib will be there. Just wait a few days more.