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I am using Ubuntu 14.04 64 bit desktop,and updating worked fine before, but suddenly it doesn't (it is a long time from last updating, so I can't ensure what operation leads this problem).

"Software & Updates" shown key exists already

As you can see, all keys exist already, but I still got a bunch of key missing errors, and I doubt it is a server error, so switched "download from" server, but no luck, then I tried to remove all keys manually and run:

sudo rm /var/lib/apt/lists/* -vf

Then:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com [key]

To add all keys in error message, but still get this error, why?

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