Arbitrary strings in bash throw python errors?

Question

Something in my setup of my shell causes arbitrary strings like "krmpfl" or "u45g5svtJ7" to create a Python error:

$> krmpfl

Traceback (most recent call last):
  File "/usr/lib/command-not-found", line 28, in <module>
    from CommandNotFound import CommandNotFound
  File "/usr/lib/python3/dist-packages/CommandNotFound/CommandNotFound.py", line 19, in <module>
    from CommandNotFound.db.db import SqliteDatabase
  File "/usr/lib/python3/dist-packages/CommandNotFound/db/db.py", line 5, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'

I would expect bash (and not python!) to throw an error of the kind "Unknown command krmpfl. Did you mean...", but any non-recognized command is for some reason passed to python. I am confused.

Does anyone have an idea on how to debug this or how to move forward? I've tried type krmpfl but this (correctly) echoes bash: type: krmpfl: not found

My setup:

Win10 using Ubuntu 18.04 within WSL
ConEmu as a console
Bash-it
Python 3.8
Click (python package) installed to simplify creating commands

chepner · Accepted Answer · 2020-02-28 20:55:24Z

2

If your current shell function defines a function named command_not_found_handle, bash runs that for a non-existent command rather than immediately failing with a "command not found" error. In your case, that function exists and calls /usr/lib/command-not-found, which appears to be a Python script that tries to download (or at least suggest you download) a package with apt_pkg, but you don't have that Python module installed, which leads to the Python exception.

answered Feb 28, 2020 at 20:55

chepner

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