Problem
If you are reading this is because when you are trying to update your Wordpress, it won't update and asks for a SSH username/password instead, as shown in the picture.
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1. SSH into the server where you have the WP website.
2. cd to the phisical physical directory where you have the website: e.g. cd /var/www/html directory.
To understand you are in the correct place, look at the files in the directory, you should see a wp-admin and wp-content folders alongside a lot of wp-****.php files.
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5. If it still does not work becaues because Wordpress tells you that '...This is usually due to inconsistent file permissions...' you may need to reset the Wordpress files ownership to be the apache user.
If you are running a standard Apache web server, then you probably want to execute a command similar to this:
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where the first www-data is the user, the second www-data is the group and the path is the root path of Wordpress (the one at bullent bullet point 2)
6 Done. Try to update Wordpress plugins and you should be able to do this now.