You can fix this issue either by waiting (usually clears up after an hour or so) or by removing a row from the options table in your WordPress database.

Solution:

  1. Login to your hosting control panel and open phpMyAdmin
  2. Click on the options table (your prefix may be different than wp_)
  3. Search for core_updater.lock and delete the row.
  4. Try updating the site again.

 

 

 

in WordPressWordPress Errors

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