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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