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Errors using "apt update"



Gentleman/Ladies

I have experienced a problem using "apt update". The program appears to
work, but I end up with the list of errors.

W: An error occurred during the signature verification. The repository
is not updated and the previous index files will be used. GPG error: 
http://security.debian.org buster/updates InRelease: The following
signatures couldn't be verified because the public key is not available:
NO_PUBKEY AA8E81B4331F7F50 NO_PUBKEY 112695A0E562B32A
W: An error occurred during the signature verification. The repository
is not updated and the previous index files will be used. GPG error: 
http://deb.debian.org/debian buster InRelease: The following signatures
couldn't be verified because the public key is not available: NO_PUBKEY
04EE7237B7D453EC NO_PUBKEY 648ACFD622F3D138 NO_PUBKEY DCC9EFBF77E11517
W: An error occurred during the signature verification. The repository
is not updated and the previous index files will be used. GPG error: 
http://deb.debian.org/debian buster-updates InRelease: The following
signatures couldn't be verified because the public key is not available:
NO_PUBKEY 04EE7237B7D453EC NO_PUBKEY 648ACFD622F3D138
W: An error occurred during the signature verification. The repository
is not updated and the previous index files will be used. GPG error: 
http://mirror.isoc.org.il/pub/debian /buster InRelease: The following
signatures couldn't be verified because the public key is not available:
NO_PUBKEY 04EE7237B7D453EC NO_PUBKEY 648ACFD622F3D138 NO_PUBKEY
DCC9EFBF77E11517
W: Failed to fetch http://deb.debian.org/debian/dists/buster/InRelease  
The following signatures couldn't be verified because the public key is
not available: NO_PUBKEY 04EE7237B7D453EC NO_PUBKEY 648ACFD622F3D138
NO_PUBKEY DCC9EFBF77E11517
W: Failed to fetch 
http://security.debian.org/dists/buster/updates/InRelease  The following
signatures couldn't be verified because the public key is not available:
NO_PUBKEY AA8E81B4331F7F50 NO_PUBKEY 112695A0E562B32A
W: Failed to fetch 
http://mirror.isoc.org.il/pub/debian/dists//buster/InRelease  The
following signatures couldn't be verified because the public key is not
available: NO_PUBKEY 04EE7237B7D453EC NO_PUBKEY 648ACFD622F3D138
NO_PUBKEY DCC9EFBF77E11517
W: Failed to fetch 
http://deb.debian.org/debian/dists/buster-updates/InRelease  The
following signatures couldn't be verified because the public key is not
available: NO_PUBKEY 04EE7237B7D453EC NO_PUBKEY 648ACFD622F3D138
W: Some index files failed to download. They have been ignored, or old
ones used instead.

Any help clearing these Errors will be greatly appreciated. 
Using Debian 10.5. for i386 version.
Thank you for your attention.
Jerry --- jfmellon@netscape.net


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