Attempted to apply a large Manjaro update (190+ packages) by...
sudo pacman -Syu
But got (after many other messages)...
(193/193) checking for file conflicts [################################################] 100%
error: failed to commit transaction (conflicting files)
firewalld: /usr/lib/python3.8/site-packages/firewall/pycache/init.cpython-38.pyc exists in filesystem
firewalld: /usr/lib/python3.8/site-packages/firewall/pycache/client.cpython-38.pyc exists in filesystem
firewalld: /usr/lib/python3.8/site-packages/firewall/pycache/dbus_utils.cpython-38.pyc exists in filesystem
and so on...
Errors occurred, no packages were upgraded.
Apply Fix
Find owner of conflicting files...
$ pacman -Qo "/usr/lib/python3.8/site-packages/firewall/"
/usr/lib/python3.8/site-packages/firewall/ is owned by firewalld 0.8.1-2
With the above information I entered
sudo pacman -S firewalld --overwrite "/usr/lib/python3.8/site-packages/firewall/*"
And finally again... sudo pacman -Syu
This time it worked!