An error occured
The following details are provided:
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W: GPG error: http://dl.google.com stable Release: The following signatures were invalid: BADSIG A040830F7FAC5991 Google, Inc. Linux Package Signing Key <linux-packages-keymaster@google.com>
W: GPG error: http://archive.canonical.com quantal Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error: http://ppa.launchpad.net quantal Release: The following signatures were invalid: BADSIG 8CA7A6E8E4FA953A Launchpad 0 A.D.
W: GPG error: http://archive.ubuntu.com quantal Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
But it didn't work. I want to know why is this problem arising and how do I resolve it?