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New User Error Problems



Hello,
I am new to linux and have installed Debian 10. I have added some new
packages without problems until now.
Using the "apt-get update" command (once a week) I am getting the
following Error Messages. Any help will be appreciated.

root@UNIX:/# apt-get update
Hit:1 http://deb.debian.org/debian buster InRelease
Get:2 https://deb.debian.org/debian buster-updates InRelease [51.9 kB]
Err:1 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
Err:2 https://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
Get:3 http://mirror.isoc.org.il/pub/debian buster InRelease [121 kB]
Err:3 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
Reading package lists... Done
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: 
https://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: 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
E: The repository 'http://mirror.isoc.org.il/pub/debian buster
InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is
therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user
configuration details.

Thank You




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