[wp-trac] [WordPress Trac] #34393: "update has failed" message won't go away

[WordPress Trac]

#34393: "update has failed" message won't go away
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 Reporter:  steevithak       |       Owner:
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Upgrade/Install  |     Version:  4.3.1
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by steevithak):

 How does one "re-run the core update"? As noted above, the error message
 links to /wp-admin/update-core.php and I tried that repeatedly but it
 didn't fix the error.

 I eventually found several forum discussions on other sites that
 recommended as a fix removing a file called .maintenance from the
 wordpress document root directory. I tried this and it worked for me.
 Everything seems to be fine again. The theory in the forum was that
 certain kinds of network timeouts during an update trigger a wordpress bug
 that causes the program to leave a spurious .maintenance file lying around
 and that results in the incorrect error message.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34393#comment:2>
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