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3200 posts and you can't add an entry to /etc/hosts or your DNS server? Come on dude, you're better than that surely? You really should appreciate by now that this error is totally generic and will have absolutely NOTHING to do with wordpress, just base level Linux admin.
Congratulations...you've now broken other things. You need to change the actual IP address line to be your host, not the loopback. As acid_kewpie pointed out...you've had over 3200 posts, and have been here for TEN YEARS. By now, you should know how to do such basic things, or research how to modify a hostname.
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