[Solved] Debian Testing (Buster) GPG Error

[manmath]

While updating Debian Testing (Buster) synaptic throws this error:

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GPG error: http://security.debian.org/debian-security buster/updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9D6D8F6BC857C906

Please suggest me how to fix this problem.

[Head_on_a_Stick]

Enter the error message into a search engine, the problem is not uncommon.

[manmath]

Tried. But not working. This time the error message is:

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An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.iitm.ac.in/debian buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 NO_PUBKEY 04EE7237B7D453ECGPG error: http://security.debian.org/debian-security buster/updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9D6D8F6BC857C906An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.iitm.ac.in/debian buster-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 NO_PUBKEY 04EE7237B7D453ECFailed to fetch http://ftp.iitm.ac.in/debian/dists/buster/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 NO_PUBKEY 04EE7237B7D453ECFailed to fetch http://ftp.iitm.ac.in/debian/dists/buster-updates/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 NO_PUBKEY 04EE7237B7D453ECSome index files failed to download. They have been ignored, or old ones used instead.

[manmath]

Finally solved the easy way. Reinstalled debian-archive-keyring package and apt is behaving good.