Question: I am trying to run a Python script: python main.py  obtaining this output: Traceback (most recent call last): File "main.py", line 8, in <module> import stateful File "/path/to/s.py", line 599, in <module> import policy as offloading_policy File "/path/to/p.py", line 2, in <module> from pacsltk import perfmodel ModuleNotFoundError: No module named 'pacsltk' Process finished with exit code 1  ... but not only pacsltk is already installed: when I try to install it anyways (pip install pacsltk), I obtain: Defaulting to user installation because normal site-packages is not writeable Collecting pacsltk Downloading pacsltk-0.2.0-py3-none-any.whl.metadata (2.3 kB) Collecting boto3>=1.11.5 (from pacsltk) Downloading boto3-1.35.54-py3-none-any.whl.metadata (6.7 kB) Requirement already satisfied: numpy>=1.18.1 in ./.local/lib/python3.8/site-packages (from pacsltk) (1.24.4) Requirement already satisfied: scipy>=1.4.1 in ./.local/lib/python3.8/site-packages (from pacsltk) (1.10.1) Collecting botocore<1.36.0,>=1.35.54 (from boto3>=1.11.5->pacsltk) Downloading botocore-1.35.54-py3-none-any.whl.metadata (5.7 kB) Requirement already satisfied: jmespath<2.0.0,>=0.7.1 in ./.local/lib/python3.8/site-packages (from boto3>=1.11.5->pacsltk) (1.0.1) Collecting s3transfer<0.11.0,>=0.10.0 (from boto3>=1.11.5->pacsltk) Downloading s3transfer-0.10.3-py3-none-any.whl.metadata (1.7 kB) Requirement already satisfied: python-dateutil<3.0.0,>=2.1 in ./.local/lib/python3.8/site-packages (from botocore<1.36.0,>=1.35.54->boto3>=1.11.5->pacsltk) (2.8.2) Collecting urllib3<1.27,>=1.25.4 (from botocore<1.36.0,>=1.35.54->boto3>=1.11.5->pacsltk) Downloading urllib3-1.26.20-py2.py3-none-any.whl.metadata (50 kB) Requirement already satisfied: six>=1.5 in /usr/lib/python3/dist-packages (from python-dateutil<3.0.0,>=2.1->botocore<1.36.0,>=1.35.54->boto3>=1.11.5->pacsltk) (1.14.0) WARNING: No metadata found in ./.local/lib/python3.8/site-packages Downloading pacsltk-0.2.0-py3-none-any.whl (9.6 kB) Downloading boto3-1.35.54-py3-none-any.whl (139 kB) Downloading botocore-1.35.54-py3-none-any.whl (12.7 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 12.7/12.7 MB 901.6 kB/s eta 0:00:00 Downloading s3transfer-0.10.3-py3-none-any.whl (82 kB) Downloading urllib3-1.26.20-py2.py3-none-any.whl (144 kB) WARNING: Error parsing dependencies of attrs: [Errno 2] File o directory non esistente: '/home/username/.local/lib/python3.8/site-packages/attrs-23.1.0.dist-info/METADATA' WARNING: Error parsing dependencies of urllib3: [Errno 2] File o directory non esistente: '/home/username/.local/lib/python3.8/site-packages/urllib3-2.0.4.dist-info/METADATA' Installing collected packages: urllib3, botocore, s3transfer, boto3, pacsltk Attempting uninstall: urllib3 WARNING: No metadata found in ./.local/lib/python3.8/site-packages Found existing installation: urllib3 2.0.4 error: uninstall-no-record-file × Cannot uninstall urllib3 2.0.4 ╰─> The package's contents are unknown: no RECORD file was found for urllib3. hint: You might be able to recover from this via: pip install --force-reinstall --no-deps urllib3==2.0.4  Furthermore, when I try to run the suggested command pip install --force-reinstall --no-deps urllib3==2.0.4, I am only able to obtain just the same error: Defaulting to user installation because normal site-packages is not writeable Collecting urllib3 Downloading urllib3-2.2.3-py3-none-any.whl.metadata (6.5 kB) WARNING: No metadata found in ./.local/lib/python3.8/site-packages Downloading urllib3-2.2.3-py3-none-any.whl (126 kB) Installing collected packages: urllib3 Attempting uninstall: urllib3 WARNING: No metadata found in ./.local/lib/python3.8/site-packages Found existing installation: urllib3 2.0.4 error: uninstall-no-record-file × Cannot uninstall urllib3 2.0.4 ╰─> The package's contents are unknown: no RECORD file was found for urllib3. hint: You might be able to recover from this via: pip install --force-reinstall --no-deps urllib3==2.0.4  Similar error when trying to pip uninstall urllib3. Also, sudo apt-get autoremove/purge applied to python-urllib3 just says that the package is not installed. The same error with urllib3 seems to be applied with whatever python package I want to install. I have looked to several other questions with this error without getting to solve this problem. What can I do?  EDIT Tried @x1337Loser's answer: now everything runs smoothly, but I had the following output after the pip command: Defaulting to user installation because normal site-packages is not writeable (... some `Requirement already satisfied` row...) WARNING: Error parsing dependencies of attrs: [Errno 2] File o directory non esistente: '/home/username/.local/lib/python3.8/site-packages/attrs-23.1.0.dist-info/METADATA'`  I am glad my program is now running, but what is that warning?

Answer: A few days ago I faced a similar problem with python-requests and these steps worked for me [Don't use sudo while installing, because this seems to work when you move to sudo but installing a package with sudo is harmful who knows what you're installing is a malware in a package form]: Remove the package manually from the site-packages directory: cd ~/.local/lib/python3.8/site-packages/ rm -rf urllib3*  now install your package: pip install pacsltk --upgrade  let me know if this solves your problem