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The error “No module named apt_pkg” typically occurs when the Python APT package is not installed or is improperly configured. This package is essential for interacting with the Advanced Package Tool (APT) system in Debian-based Linux distributions.

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Method 1: Install the python-apt package

This is the most straightforward fix — the apt_pkg module is part of the python-apt package. 
sudo apt-get update
sudo apt-get install python-apt  # or python3-apt for Python 3

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Method 2: Reinstall python3-apt

This reinstalls the package to ensure all files are correctly placed. 
sudo apt-get install python3-apt --reinstall

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Method 3: Copy the .so file to the correct location

This method involves copying the shared object file to the correct location. 
cd /usr/lib/python3/dist-packages
sudo cp apt_pkg.cpython-310-x86_64-linux-gnu.so apt_pkg.so
Adjust the filename to match your Python version and architecture (e.g., cpython-311 for Python 3.11).

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