pf9-hostagent Failing With Error "No module named 'apt_pkg'"

Problem

The host is disconnected from Management Plane and pf9-hostagent service is failing and hostagent-daemon.log shows error No module named 'apt_pkg'

hostagent-daemon.log
    
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customlogger.py INFO - from pf9app.pf9_app_db import Pf9AppDb as AppDb, Pf9AgentDbcustomlogger.py INFO -   File "/opt/pf9/hostagent/lib/python3.9/site-packages/pf9app/pf9_app_db.py", line 21, in <module> customlogger.py INFO - import aptcustomlogger.py INFO -   File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module> customlogger.py INFO - import apt_pkgcustomlogger.py INFO - ModuleNotFoundErrorcustomlogger.py INFO - :customlogger.py INFO - No module named 'apt_pkg'
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Environment

pf9-hostagent
Python3

Cause

When a newer python version is installed the link will update to point to the newest python version, which leads to the error of apt_pkg module not being found.

Resolution

Make sure package python3-apt is installed on the host.
Fix the python symblink:

command
    
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# cd /usr/lib/python3/dist-packages# ln -s apt_pkg.cpython-35m-x86_64-linux-gnu.so apt_pkg.so# ln -s apt_inst.cpython-35m-x86_64-linux-gnu.so  apt_inst.so
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Restart pf9-hostagent service:

command
    
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# systemctl restart pf9-hostagent
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