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
