Ubuntu update: BADSIG

หลายๆครั้งที่ ใช้ update manager จะขึ้น error เช่น W: GPG error: http://archive.canonical.com intrepid Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://wine.budgetdedicated.com intrepid Release: The following signatures were invalid: […]