NetworkManager Services Failing to Start with bus-manager: cannot connect to D-Bus Error

Issue

• NetworkManager service and other D-Bus-dependen servicesfailto start or operate correctly after system changes such asupgrades,reboots, orconfiguration modifications`.

• In the system logs, observe errors similar to the following:

  Aug 08 15:37:36 test.example.com systemd[1]: NetworkManager.service: Main process exited, code=exited, status=1/FAILURE
  Aug 08 15:37:36 test.example.com systemd[1]: NetworkManager.service: Failed with result 'exit-code'.
  

  # Aug 08 15:37:36 test.example.com NetworkManager[1381]: <error> [1754647656.6488] bus-manager: cannot connect to D-Bus: Could not connect: No such file or directory