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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Cannot install on Debian (via mu-editor) - ERROR: ResolutionImpossible","articleBody":"### Bug summary\n\nI'm trying to install mu-editor to write some code for a Pi Pico; mu-editor is based on Python, and apparently mathplotlib is a dependency. I cannot install mathplotlib on Debian 11 stable. It says dependencies `freetype` and `png` are not met. Please advise.\n\n### Code for reproduction\n\n```python\nDebian 11; Python 3.9.2; `sudo apt install python3-pip`; `pip3 install mu-editor`\n```\n\n\n### Actual outcome\n\n```\r\n...\r\nCollecting matplotlib==2.2.2\r\n  Downloading matplotlib-2.2.2.tar.gz (37.3 MB)\r\n     |████████████████████████████████| 37.3 MB 1.9 MB/s \r\n    ERROR: Command errored out with exit status 1:\r\n     command: /usr/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '\"'\"'/tmp/pip-install-wjosel1n/matplotlib_68b8d4a2fe554f09ab7aeb951168bcc1/setup.py'\"'\"'; __file__='\"'\"'/tmp/pip-install-wjosel1n/matplotlib_68b8d4a2fe554f09ab7aeb951168bcc1/setup.py'\"'\"';f=getattr(tokenize, '\"'\"'open'\"'\"', open)(__file__);code=f.read().replace('\"'\"'\\r\\n'\"'\"', '\"'\"'\\n'\"'\"');f.close();exec(compile(code, __file__, '\"'\"'exec'\"'\"'))' egg_info --egg-base /tmp/pip-pip-egg-info-fg_514_s\r\n         cwd: /tmp/pip-install-wjosel1n/matplotlib_68b8d4a2fe554f09ab7aeb951168bcc1/\r\n    Complete output (62 lines):\r\n    ============================================================================\r\n    Edit setup.cfg to change the build options\r\n    \r\n    BUILDING MATPLOTLIB\r\n                matplotlib: yes [2.2.2]\r\n                    python: yes [3.9.2 (default, Feb 28 2021, 17:03:44)  [GCC\r\n                            10.2.1 20210110]]\r\n                  platform: yes [linux]\r\n    \r\n    REQUIRED DEPENDENCIES AND EXTENSIONS\r\n                     numpy: yes [version 1.19.5]\r\n          install_requires: yes [handled by setuptools]\r\n                    libagg: yes [pkg-config information for 'libagg' could not\r\n                            be found. Using local copy.]\r\n                  freetype: no  [The C/C++ header for freetype2 (ft2build.h)\r\n                            could not be found.  You may need to install the\r\n                            development package.]\r\n                       png: no  [pkg-config information for 'libpng' could not\r\n                            be found.]\r\n                     qhull: yes [pkg-config information for 'libqhull' could not\r\n                            be found. Using local copy.]\r\n    \r\n    OPTIONAL SUBPACKAGES\r\n               sample_data: yes [installing]\r\n                  toolkits: yes [installing]\r\n                     tests: no  [skipping due to configuration]\r\n            toolkits_tests: no  [skipping due to configuration]\r\n    \r\n    OPTIONAL BACKEND EXTENSIONS\r\n                    macosx: no  [Mac OS-X only]\r\n                    qt5agg: no  [PySide2 not found; PyQt5 not found]\r\n                    qt4agg: no  [PySide not found; PyQt4 not found]\r\n                   gtk3agg: yes [installing, version 3.24.24]\r\n    Traceback (most recent call last):\r\n      File \"\u003cstring\u003e\", line 1, in \u003cmodule\u003e\r\n      File \"/tmp/pip-install-wjosel1n/matplotlib_68b8d4a2fe554f09ab7aeb951168bcc1/setup.py\", line 197, in \u003cmodule\u003e\r\n        msg = pkg.install_help_msg()\r\n      File \"/tmp/pip-install-wjosel1n/matplotlib_68b8d4a2fe554f09ab7aeb951168bcc1/setupext.py\", line 592, in install_help_msg\r\n        release = platform.linux_distribution()[0].lower()\r\n    AttributeError: module 'platform' has no attribute 'linux_distribution'\r\n                 gtk3cairo: yes [installing, version 3.24.24]\r\n                    gtkagg: no  [Requires pygtk]\r\n                     tkagg: yes [installing; run-time loading from Python Tcl /\r\n                            Tk]\r\n                     wxagg: no  [requires wxPython]\r\n                       gtk: no  [Requires pygtk]\r\n                       agg: yes [installing]\r\n                     cairo: yes [installing, pycairo version 1.16.2]\r\n                 windowing: no  [Microsoft Windows only]\r\n    \r\n    OPTIONAL LATEX DEPENDENCIES\r\n                    dvipng: no\r\n               ghostscript: yes [version 9.53.3]\r\n                     latex: yes [version 3.14159265]\r\n                   pdftops: yes [version 20.09.0]\r\n    \r\n    OPTIONAL PACKAGE DATA\r\n                      dlls: no  [skipping due to configuration]\r\n    \r\n    ============================================================================\r\n                            * The following required packages can not be built:\r\n                            * freetype, png\r\n    ----------------------------------------\r\nWARNING: Discarding https://files.pythonhosted.org/packages/ec/ed/46b835da53b7ed05bd4c6cae293f13ec26e877d2e490a53a709915a9dcb7/matplotlib-2.2.2.tar.gz#sha256=4dc7ef528aad21f22be85e95725234c5178c0f938e2228ca76640e5e84d8cde8 (from https://pypi.org/simple/matplotlib/). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.\r\nCollecting mu-editor\r\n  Downloading mu_editor-1.0.2-py3-none-any.whl (2.0 MB)\r\n     |████████████████████████████████| 2.0 MB 513 kB/s \r\nCollecting pyqt5==5.11.3\r\n  Downloading PyQt5-5.11.3-5.11.2-cp35.cp36.cp37.cp38-abi3-manylinux1_x86_64.whl (117.8 MB)\r\n     |████████████████████████████████| 117.8 MB 727 kB/s \r\nCollecting PyQtChart==5.11.3\r\n  Downloading PyQtChart-5.11.3-5.11.2-cp35.cp36.cp37.cp38-abi3-manylinux1_x86_64.whl (1.1 MB)\r\n     |████████████████████████████████| 1.1 MB 11.0 MB/s \r\nCollecting qscintilla==2.10.8\r\n  Downloading QScintilla-2.10.8-5.11.2-cp35.cp36.cp37.cp38-abi3-manylinux1_x86_64.whl (2.6 MB)\r\n     |████████████████████████████████| 2.6 MB 553 kB/s \r\nCollecting mu-editor\r\n  Downloading mu_editor-1.0.1-py3-none-any.whl (1.9 MB)\r\n     |████████████████████████████████| 1.9 MB 860 kB/s \r\nCollecting pyqt5==5.11.2\r\n  Downloading PyQt5-5.11.2-5.11.1-cp35.cp36.cp37.cp38-abi3-manylinux1_x86_64.whl (117.9 MB)\r\n     |████████████████████████████████| 117.9 MB 2.1 MB/s \r\nCollecting PyQtChart==5.11.2\r\n  Downloading PyQtChart-5.11.2-5.11.1-cp35.cp36.cp37.cp38-abi3-manylinux1_x86_64.whl (1.1 MB)\r\n     |████████████████████████████████| 1.1 MB 190.3 MB/s \r\nCollecting qscintilla==2.10.7\r\n  Downloading QScintilla-2.10.7-5.11.1-cp35.cp36.cp37.cp38-abi3-manylinux1_x86_64.whl (2.6 MB)\r\n     |████████████████████████████████| 2.6 MB 3.3 MB/s \r\nCollecting mu-editor\r\n  Downloading mu_editor-1.0.0-py3-none-any.whl (1.7 MB)\r\n     |████████████████████████████████| 1.7 MB 1.9 MB/s \r\nERROR: Cannot install mu-editor==1.0.0, mu-editor==1.0.1, mu-editor==1.0.2 and mu-editor==1.0.3 because these package versions have conflicting dependencies.\r\n\r\nThe conflict is caused by:\r\n    mu-editor 1.0.3 depends on matplotlib==2.2.2\r\n    mu-editor 1.0.2 depends on matplotlib==2.2.2\r\n    mu-editor 1.0.1 depends on matplotlib==2.2.2\r\n    mu-editor 1.0.0 depends on matplotlib==2.2.2\r\n\r\nTo fix this you could try to:\r\n1. loosen the range of package versions you've specified\r\n2. remove package versions to allow pip attempt to solve the dependency conflict\r\n\r\nERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies\r\n```\n\n### Expected outcome\n\nshould install all dependencies as specified\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nDebian 11 (bullseye) ; Linux aleph 5.10.0-10-amd64 #1 SMP Debian 5.10.84-1 (2021-12-08) x86_64 GNU/Linux\n\n### Matplotlib Version\n\n2.2.2\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n3.9.2\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\npip","author":{"url":"https://github.com/Sciss","@type":"Person","name":"Sciss"},"datePublished":"2022-01-05T14:26:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/22113/matplotlib/issues/22113"}