I am trying to update my Banana Pi M64:

 

missinglink% cat /etc/armbian-release 
# PLEASE DO NOT EDIT THIS FILE
BOARD=bananapim64
BOARD_NAME="Banana Pi M64"
BOARDFAMILY=sun50iw1
BUILD_REPOSITORY_URL=https://github.com/armbian/build
BUILD_REPOSITORY_COMMIT=869a89d6-dirty
DISTRIBUTION_CODENAME=focal
DISTRIBUTION_STATUS=supported
VERSION=20.05.4
LINUXFAMILY=sunxi64
BRANCH=current
ARCH=arm64
IMAGE_TYPE=stable
BOARD_TYPE=conf
INITRD_ARCH=arm64
KERNEL_IMAGE_TYPE=Image

 

but when I run this command:

missinglink% sudo apt update && sudo apt dist-upgrade -y
 

I get these errors:

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 stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131 NO_PUBKEY F8D2585B8783D481
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 stable-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131
W: Failed to fetch http://deb.debian.org/debian/dists/stable/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131 NO_PUBKEY F8D2585B8783D481
W: Failed to fetch http://deb.debian.org/debian/dists/stable-updates/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131
W: Some index files failed to download. They have been ignored, or old ones used instead.
 

and the update is a noop.  What do I need to fix this?

 

Try importing updated keys from Debian, similar to this:

 

https://talk.plesk.com/threads/no_pubkey-bd11a6aa914bdf7e.368962/post-924677