root@raspberrypi:~# echo “deb Index of /debian buster-backports main” > /etc/apt/sources.list.d/buster-backports.list
root@raspberrypi:~# apt update
Hit:1 Index of /repos/asl_builds/ buster InRelease
Get:2 Index of /debian buster-backports InRelease [51.4 kB]
Get:3 Index of /raspbian buster InRelease [15.0 kB]
Hit:4 Index of /DVSwitch_Repository buster InRelease
Hit:5 Index of /debian buster InRelease
Err:2 Index of /debian buster-backports InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131
Get:6 Index of /raspbian buster/main armhf Packages [13.0 MB]
Reading package lists… Done
W: GPG error: Index of /debian buster-backports InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131
E: The repository ‘Index of /debian buster-backports 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.
@w5mgm - When was the last time you ran an apt update && apt upgrade? That usually means you have an obsolete Debian signers keyfile. It’s also important to know that Buster is no longer maintained by the Debian project so you may have issues that have to be worked around.
@w5mgm Returning to this… you should be able to fix your key situation. Run this as root:
gpg --keyserver keyserver.ubuntu.com --recv-keys 0E98404D386FA1D9
gpg --keyserver keyserver.ubuntu.com --recv-keys 6ED0E7B82643E131
gpg --export --armor 0E98404D386FA1D9 | apt-key add -
gpg --export --armor 6ED0E7B82643E131 | apt-key add -
That should import the keys you need.