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How can I stop being prompted to unlock the 'default' keyring on boot?

I was using my ubuntu 12.04 without any problem. Suddenly when I tried to connect to a vpn, the Unlock Login Keyring window appeared. I tried my user password, also my vpn password and none of them were accepted. Every time I try to change any of my vpn settings the window will appear again. It will be gone after many times of cancellation. How can I get rid of this window forever?!

marked as duplicate by jokerdino, Jorge Castro, Eliah Kagan, John S Gruber, user61928 Oct 5 '12 at 7:52

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