概要
pip install を実行した際に、Cannot uninstall blinker 1.4 という見慣れないエラーが発生した。
この対処法を記載したのがこの記事です。
実行環境
Windwos 上の WSL2 内で、 airobotbook/ros2-desktop-ai-robot-book-humble という docker イメージをビルドし、その中で pip install を行っていました。
具体的には以下の通り。
| item | version など |
|---|---|
| OS | Windows Home Edition (WSL2) |
| docker image | airobotbook/ros2-desktop-ai-robot-book-humble |
| OS in docker image | Ubuntu 22.04.5 LTS |
| python | 3.10.12 |
エラー発生状況
bash
$ pip install -r requirements.txt
...
Attempting uninstall: blinker
Found existing installation: blinker 1.4
━━━━━━━━━━━━━━━━╺━━━━━━━━━━━━━━━━━━━━━━━ 15/37 [blinker]error: uninstall-distutils-installed-package
× Cannot uninstall blinker 1.4
╰─> It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
エラーまでの出力全文を見る
※ 後ほど原因は mlflow であることが判明したので、 mlflow のみを install しています。
$ pip install -r requirements.txt
WARNING: The directory '/home/ubuntu/.cache/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you should use sudo's -H flag.
Collecting mlflow
Downloading mlflow-2.22.0-py3-none-any.whl.metadata (30 kB)
Collecting mlflow-skinny==2.22.0 (from mlflow)
Downloading mlflow_skinny-2.22.0-py3-none-any.whl.metadata (31 kB)
Collecting Flask<4 (from mlflow)
Downloading flask-3.1.0-py3-none-any.whl.metadata (2.7 kB)
Requirement already satisfied: Jinja2<4,>=2.11 in /home/ubuntu/.local/lib/python3.10/site-packages (from mlflow) (3.1.5)
Collecting alembic!=1.10.0,<2 (from mlflow)
Downloading alembic-1.15.2-py3-none-any.whl.metadata (7.3 kB)
Collecting docker<8,>=4.0.0 (from mlflow)
Downloading docker-7.1.0-py3-none-any.whl.metadata (3.8 kB)
Collecting graphene<4 (from mlflow)
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Collecting gunicorn<24 (from mlflow)
Downloading gunicorn-23.0.0-py3-none-any.whl.metadata (4.4 kB)
Requirement already satisfied: markdown<4,>=3.3 in /usr/local/lib/python3.10/dist-packages (from mlflow) (3.8)
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Collecting cachetools<6,>=5.0.0 (from mlflow-skinny==2.22.0->mlflow)
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Installing collected packages: zipp, wrapt, threadpoolctl, sqlparse, smmap, pyasn1, pyarrow, packaging, joblib, itsdangerous, greenlet, graphql-core, cloudpickle, click, cachetools, blinker, sqlalchemy, scikit-learn, rsa, pyasn1-modules, importlib_metadata, gunicorn, graphql-relay, gitdb, Flask, docker, deprecated, opentelemetry-api, graphene, google-auth, gitpython, alembic, opentelemetry-semantic-conventions, databricks-sdk, opentelemetry-sdk, mlflow-skinny, mlflow
Attempting uninstall: zipp
Found existing installation: zipp 1.0.0
Uninstalling zipp-1.0.0:
Successfully uninstalled zipp-1.0.0
Attempting uninstall: pyarrow
Found existing installation: pyarrow 20.0.0
Uninstalling pyarrow-20.0.0:
Successfully uninstalled pyarrow-20.0.0
Attempting uninstall: packaging
Found existing installation: packaging 25.0
Uninstalling packaging-25.0:
Successfully uninstalled packaging-25.0
Attempting uninstall: itsdangerous
Found existing installation: itsdangerous 2.1.0
Uninstalling itsdangerous-2.1.0:
Successfully uninstalled itsdangerous-2.1.0
Attempting uninstall: click
Found existing installation: click 8.0.3
Uninstalling click-8.0.3:
Successfully uninstalled click-8.0.3
Attempting uninstall: blinker
Found existing installation: blinker 1.4
━━━━━━━━━━━━━━━━╺━━━━━━━━━━━━━━━━━━━━━━━ 15/37 [blinker]error: uninstall-distutils-installed-package
× Cannot uninstall blinker 1.4
╰─> It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
対処法
1. blinker に依存しているパッケージを利用しない
まず、私の場合は mlflow が blinker に依存していたので、requirements.txt から mlflow をコメントアウトするだけで解決しました。
ただ、どうしても mlflow を使いたい場合にはどうすればよいか。それを以下で考えてみました。
2. --ignore-installed オプションの利用 (非推奨)
以下の二つの記事で案内されていました。
1つ目の記事は embedchain 、2つ目の記事は paddlepaddle というライブラリをインストールしようとして同じエラーに直面しているようでしたが、いずれも --ignore-installed というオプションを利用することによって問題を回避しているようでした。
具体的には、今回の場合は以下のようにコマンドを打つことで、問題を回避できる可能性があります。（私の場合は回避できました）
$ pip install --ignore-installed -r requirements.txt
このオプションについて詳しく知りたい方は以下の記事が参考になると思います。
私なりにこのオプションについて解説すると以下のようになります。
-
--ignore-installedは、既にインストールされている（古い）パッケージを残したまま、新しいバージョンの同名パッケージをインストールして、双方を共存させる - その結果、 uninstall が発生しないので、
uninstall blinker 1.4に失敗することもない
このため、各パッケージの import 実行時によくわからないエラーに出くわすリスクが残っていると思います。
そのため非推奨とさせていただきました
3. docker イメージの変更
こちらで対処できるなら、こちらの対処法の方がいいかもしれません。
以下の記事で提案されていました。
今回私は、この対処法はコストが高すぎて採用できなかったのですが、python 3.12 以上であれば blinker が削除されているらしい ので、この問題は発生しないと予想されます。
4. python3-blinker というパッケージのアンインストール
以下の記事で提案されていた対処法です。
flask も blinker に依存しているようですね。
対処法としては比較的簡単で、 blinker に依存しているパッケージをインストールする前に、 python3-blinker を除去しておけば、 python パッケージの blinker も削除されて、問題が解決するようです。
具体的には以下のようにします。
# Docker コンテナ内で実施した
$ apt remove python3-blinker
$ pip install -r requirements.txt
この方法でも、私は問題が解消できました。
Dockerfile に書く場合は以下のように書くと良いでしょう。
Dockerfile
RUN apt -y remove python3-blinker
RUN pip install -r requirements.txt
判明している原因パッケージ
以下のパッケージを利用している場合には、この問題が発生するようですね( ˘ω˘)ｽﾔｧ。。。
- embedchain
- flask
- mlflow
- paddlepaddle