Error The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 93D6889F9F0E78D5

 Error pada saat update Linux seperti dibawah


pi@raspberrypi:~/.config/htop $ sudo apt-get update

Hit:1 http://deb.debian.org/debian buster InRelease

Hit:2 http://deb.debian.org/debian-security buster/updates InRelease

Hit:3 http://deb.debian.org/debian buster-updates InRelease

Hit:4 http://archive.raspberrypi.org/debian buster InRelease

Get:5 http://mirrors.bfsu.edu.cn/armbian buster InRelease [18.3 kB]

Err:5 http://mirrors.bfsu.edu.cn/armbian buster InRelease

  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 93D6889F9F0E78D5

Reading package lists... Done

W: GPG error: http://mirrors.bfsu.edu.cn/armbian buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 93D6889F9F0E78D5

E: The repository 'http://apt.armbian.com 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.


cara mengatasinya ketikan perintah dibawah dengan key yang ditampilkan saat error

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 68980A0EA10B4DE8




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