## 事象 以下のように[[Pip]]でインストールをしようとしたら ```console pip install xxx ``` 以下のエラーが出る。 ```error error: externally-managed-environment × This environment is externally managed ╰─> To install Python packages system-wide, try apt install python3-xyz, where xyz is the package you are trying to install. If you wish to install a non-Debian-packaged Python package, create a virtual environment using python3 -m venv path/to/venv. Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make sure you have python3-full installed. If you wish to install a non-Debian packaged Python application, it may be easiest to use pipx install xyz, which will manage a virtual environment for you. Make sure you have pipx installed. See /usr/share/doc/python3.11/README.venv for more information. note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages. hint: See PEP 668 for the detailed specification. ``` ## 原因 [[Marking Python base environments as “externally managed”|PEP 668]]によるもの。 ## 解決方法 仮想環境を作成してその中でインストールする。 CI環境など、明らかに破壊の心配がない場合は `--break-system-packages` オプションを指定して回避もできる。 ## 参考 - ["This environment is externally managed"のエラーが出たとき、python仮想環境をつかう。｜真壁匠](https://note.com/lucky_gerbil210/n/n0de8721c05bc)