Update error W:GPG signature validation error in Ubuntu

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Reading Package List ... Complete
W:GPG error: http://mirrors.163.com precise Release: Unable to verify the following signature because there is no public key: No_pubkey 40976EAF437D05B5
W:GPG error: http://mirrors.163.com precise-updates Release: Unable to verify the following signature because there is no public key: No_pubkey 40976EAF437D05B5
W:GPG error: http://mirrors.163.com precise-backports Release: Unable to verify the following signature because there is no public key: No_pubkey 40976EAF437D05B5
W:GPG error: http://mirrors.163.com precise-security Release: Unable to verify the following signature because there is no public key: No_pubkey 40976EAF437D05B5

40976EAF437D05B5 8-bit after replication

Workaround:

sudo apt-key adv--recv-keys--keyserver keyserver.ubuntu.com 437D05B5

EXECUTING:GPG--ignore-time-conflict--no-options--no-default-keyring--secret-keyring/tmp/tmp. Qdmowaq4re--TRUSTDB-NAME/ETC/APT/TRUSTDB.GPG--KEYRING/ETC/APT/TRUSTED.GPG--PRIMARY-KEYRING/ETC/APT/TRUSTED.GPG --recv-keys--keyserver keyserver.ubuntu.com 437D05B5
GPG: Download key ' 437d05b5 ' from HKP server keyserver.ubuntu.com
GPG: Key 437d05b5: Public key "Ubuntu Archive Automatic Signing key <[email protected]>" imported
GPG: No absolute trust key found
GPG: Total Processed Quantity: 1
GPG: Imported: 1

After that, it's normal ...

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Update error W:GPG signature validation error in Ubuntu