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.
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