Postfix Failed to start : unable to set exclusive lock: Resource temporarily unavailable

If you’re getting the following error starting Postfix on a Virtualmin system:

Postfix Failed to start : unable to set exclusive lock: Resource temporarily unavailable

You need to kill the process and start Postfix using the proper command.

To find the process:

#fuser /var/lib/postfix/master.lock
7881

Then kill it:

#kill 7881

Note:
If your system cannot find fuser following this article.

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