apt-get upgrade 시 the public key is not available:

Debian_10]root~[20:24:59 apt-get upgrade

Reading package lists... Done

Building dependency tree

Reading state information... Done

Calculating upgrade... Done

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

Debian_10]root~[20:25:17 apt-get update

Hit:1 http://security.debian.org/debian-security buster/updates InRelease

Hit:2 http://security.debian.org jessie/updates InRelease

Hit:5 http://deb.debian.org/debian buster InRelease

Ign:3 http://cdn-fastly.deb.debian.org/debian jessie InRelease

Hit:4 http://cdn-fastly.deb.debian.org/debian jessie-updates InRelease

Get:7 http://packages.openmediavault.org/public erasmus InRelease [14.8 kB]

Hit:6 http://cdn-fastly.deb.debian.org/debian jessie Release

Err:7 http://packages.openmediavault.org/public erasmus InRelease

  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7E7A6C592EF35D13 NO_PUBKEY 24863F0C716B980B

Reading package lists... Done

W: GPG error: http://packages.openmediavault.org/public erasmus InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7E7A6C592EF35D13 NO_PUBKEY 24863F0C716B980B

E: The repository 'http://packages.openmediavault.org/public erasmus 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.

================ 문제 발생 ====================

해결 >>> 끝에 키번호 적용

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7E7A6C592EF35D13

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 24863F0C716B980B

Debian_10]root~[20:35:07 apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7E7A6C592EF35D13

Executing: /tmp/apt-key-gpghome.EFdSh3PMzW/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 7E7A6C592EF35D13

gpg: key 7E7A6C592EF35D13: public key "OpenMediaVault.org (OpenMediaVault packages archive) <packages@openmediavault.org>" imported

gpg: Total number processed: 1

gpg:               imported: 1

Debian_10]root~[20:38:16 apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 24863F0C716B980B

Executing: /tmp/apt-key-gpghome.JYPpCOukfZ/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 24863F0C716B980B

gpg: key 24863F0C716B980B: public key "OpenMediaVault.org (OpenMediaVault packages archive) <packages@openmediavault.org>" imported

gpg: Total number processed: 1

gpg:               imported: 1

실행 결과 >> ok

Debian_10]root~[20:38:24 apt-get update

Hit:1 http://security.debian.org/debian-security buster/updates InRelease

Hit:2 http://deb.debian.org/debian buster InRelease

Hit:3 http://security.debian.org jessie/updates InRelease

Ign:4 http://cdn-fastly.deb.debian.org/debian jessie InRelease

Hit:5 http://cdn-fastly.deb.debian.org/debian jessie-updates InRelease

Get:6 http://packages.openmediavault.org/public erasmus InRelease [14.8 kB]

Hit:7 http://cdn-fastly.deb.debian.org/debian jessie Release

Get:9 http://packages.openmediavault.org/public erasmus/main armhf Packages [6,742 B]

Fetched 21.6 kB in 7s (3,169 B/s)

Reading package lists... Done

Debian_10]root~[20:38:45

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