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When you run pip in your terminal, you might see the following error: 
$ pip --version

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'
This error indicates that the apt_pkg module is missing. This can happen if the Python environment is not set up correctly.

​
Resolution

1
Find the apt_pkg shared object file
2
cd /usr/lib/python3/dist-packages
ls -l apt_pkg* # find the apt_pkg.** path
3
Copy the file to the correct location
4
Replace <version> and <arch> with the values shown in the ls output:
5
sudo cp apt_pkg.cpython-<version>-<arch>.so apt_pkg.so
6
Reinstall pip
7
sudo apt-get install --reinstall python3-pip

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