When I am trying to check my updates through 'update manager' .. It is downloading up to certain limit .. then shows the following error ..
An error occurred
The following details are provided:
W: GPG error: http://ppa.launchpad.net intrepid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B9674A0E7B0FB2CA
W: GPG error: http://ppa.launchpad.net intrepid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EE6F9258A958418A
W: GPG error: http://packages.medibuntu.org intrepid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2EBC26B60C5A2783
What I sd do? .. pls help ...![]()



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