Resolve "Briefly unavailable for scheduled maintenance" error in Wordpress

Cause - happens when a plugin update gets ‘stuck’ or when trying to update multiple plugins at the same time in WordPress. If it doesn’t go away:

• SSH to the server (or FTP)
• Navigate to the web root directory. Its /var/www/html for Apache and Nginx generally.
• Navigate to the root folder of the website as you might have more than one website running.
• Find and delete the file called “.maintenance”. (rm foobar)

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