Super, dass Du mir unter die Arme greifst.
cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
NAME="Raspbian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"
pi@raspberrypi:~ $ sudo apt update -y
Hit:1 http://phoscon.de/apt/deconz buster InRelease
Get:2 http://archive.raspberrypi.org/debian buster InRelease [32.6 kB]
Get:3 http://raspbian.raspberrypi.org/raspbian buster InRelease [15.0 kB]
Get:4 https://repo.z-wave.me/z-way/raspbian buster InRelease [1,806 B]
E: Repository 'http://archive.raspberrypi.org/debian buster InRelease' changed its 'Suite' value from 'testing' to 'oldstable'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
Do you want to accept these changes and continue updating from this repository? [y/N] Y
Get:5 http://archive.raspberrypi.org/debian buster/main armhf Packages [392 kB]
E: Repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' changed its 'Suite' value from 'stable' to 'oldstable'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
Do you want to accept these changes and continue updating from this repository? [y/N] Y
Get:6 http://raspbian.raspberrypi.org/raspbian buster/main armhf Packages [13.0 MB]
Err:4 https://repo.z-wave.me/z-way/raspbian buster InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D5AA8FC24C6547A2
Get:7 http://raspbian.raspberrypi.org/raspbian buster/contrib armhf Packages [58.8 kB]
Get:8 http://raspbian.raspberrypi.org/raspbian buster/non-free armhf Packages [104 kB]
Fetched 13.6 MB in 7s (1,838 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
182 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://repo.z-wave.me/z-way/raspbian buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D5AA8FC24C6547A2
W: Failed to fetch https://repo.z-wave.me/z-way/raspbian/dists/buster/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D5AA8FC24C6547A2
W: Some index files failed to download. They have been ignored, or old ones used instead.