Internal Server Error - getDateFormatter() on null When doing a manual update from 2.6.3012 to 2.7.8, I get the following error:


  Internal Server Error
  Call to a member function getDateFormatter() on null


I get the following error when enabling devMode:



Updating from the Dashboard fails too, but in a slightly more verbose fashion:


  [curl] 28: Operation timed out after 30001 milliseconds with 0 out of 0 bytes received [url] https://download.craftcdn.com/craft/2.7/2.7.8/Patch/2.6.3012/[redacted string of numbers].zip


Any help is welcome.
Craft support had suggested looking into the locales table, which had a singular entry for en_us.

What allowed me to update was to copy the following folder and its content: app/framework/i18n/data. It was entirely missing from the Craft-2.7.8.zip file I had downloaded.