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Install gpg (if needed): sudo apt-get install gpg

Import keys:  

This can be done via a keyserver:  gpg --recv-keys CC56CEA8 DB3ECA42 2908DED2 6FE50F1C

Or this can be done by importing the keys stored in the source distribution's KEYS file:  gpg --import KEYS

Verify signatures and hash files:

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