signature has become invalid
2022-12-07 01:53:53 root@M-DNS:~# apt update
Hit:2 https://deb.debian.org/debian bullseye InRelease
Get:3 https://deb.debian.org/debian bullseye-updates InRelease [44.1 kB]
Get:4 https://deb.debian.org/debian-security bullseye-security InRelease [48.4 kB]
Get:5 https://deb.debian.org/debian bullseye-backports InRelease [49.0 kB]
Get:1 https://www.lesbonscomptes.com/upmpdcli/downloads/raspbian bullseye InRelease [3094 B]
Hit:6 https://mirrors.xtom.de/armbian bullseye InRelease
Get:7 https://deb.debian.org/debian-security bullseye-security/main arm64 Packages [205 kB]
Get:8 https://deb.debian.org/debian bullseye-backports/main arm64 Packages.diff/Index [63.3 kB]
Get:9 https://deb.debian.org/debian bullseye-backports/main arm64 Packages T-2022-12-06-2009.54-F-2022-12-06-2009.54.pdiff [18.3 kB]
Get:9 https://deb.debian.org/debian bullseye-backports/main arm64 Packages T-2022-12-06-2009.54-F-2022-12-06-2009.54.pdiff [18.3 kB]
Err:1 https://www.lesbonscomptes.com/upmpdcli/downloads/raspbian bullseye InRelease
The following signatures were invalid: EXPKEYSIG 7808CE96D38B9201 Jean-Francois Dockes <jf@dockes.org>
Fetched 431 kB in 9s (48.2 kB/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://www.lesbonscomptes.com/upmpdcli/downloads/raspbian bullseye InRelease: The following signatures were invalid: EXPKEYSIG 7808CE96D38B9201 Jean-Francois Dockes <jf@dockes.org>
W: Failed to fetch http://www.lesbonscomptes.com/upmpdcli/downloads/raspbian/dists/bullseye/InRelease The following signatures were invalid: EXPKEYSIG 7808CE96D38B9201 Jean-Francois Dockes <jf@dockes.org>
W: Some index files failed to download. They have been ignored, or old ones used instead.