Have you experiencing this kind of problem and really don’t know how you’re going to fix this. If yes, then we are the same but thanks to Google and found some solution.
Just to help you with this issue i am going to show you how to fix this problem. Often times, this error was due to your server hiccuping; maybe the memory ran low for a minute, or some other minor issue. The worst part is that usually that message will get “stuck” there, even though you’ve successfully updated everything later!
So consider this steps to fix this error.
1. First thing you want to do is wait for 5-10 minutes.
Without getting into the techy details, there’s a timeout involved behind the scenes, so just wait a bit, then try again.
After doing this however many number of times is necessary to complete the updates you’ll probably still get the “An automated WordPress update has failed to complete – please attempt the update again now.” error message, and even though going to your updates page says there are no more updates, it still hangs out up top on your screen.
2. Fortunately, there’s a very simple fix, and it’s completely safe to do.
Open your FTP client, (or whatever other method you normally use to access the actual files where your WordPress is hosted), and look for a .maintenance file. The “.” (dot) in front of it means it’s a hidden file, so you may have to choose the option to view hidden files in your FTP client in order to see it.
3. Delete it.
And that’s it. When you tried refreshing your wordpress site, the “An automated WordPress update has failed to complete – please attempt the update again now.” message will be gone.(via geekdrop.com)