Why are all Google apps crashing?

Nov 29, 2014
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I've got a Nexus 5 running Android L, and I've just done a standard update of all my apps to their latest version - no Google app is running now, though. Not Google Keyboard, nor Keep, nor Camera, nor Plus. This, obviously, is a very big issue. I just get a message like "Unfortunately, Gmail has stopped."

What is going on, and why is everything crashing? How can I make everything work again?
 

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