MSGID:  f8a362fc
REPLY: <20251216093548.4c0e67bf@N22> 6ace4fd1
PID: PyGate 1.5.2
TID: PyGate/Linux 1.5.2
CHRS: ASCII 1
TZUTC: 0000
REPLYADDR invalid@invalid.invalid
REPLYTO 3:633/10 UUCP
attend  writes:
> Thanks for your reply. I was thinking it could be a problem in my
> sources.list, but it's useful to show the error messages and my
> sources.list as you said.
>
> Sources.list:
>
> deb http://raspbian.raspberrypi.org/raspbian/ trixie main contrib
> non-free rpi 
> deb http://archive.raspberrypi.org/debian/ trixie main
> # Uncomment line below then 'apt-get update' to enable 'apt-get source'
> #deb-src http://raspbian.raspberrypi.org/raspbian/ trixie main contrib
> non-free rpi
>
> Error message:
>
> @rpi4:/etc/apt# apt update
> Hit:1 http://raspbian.raspberrypi.org/raspbian trixie InRelease
> Get:2 http://archive.raspberrypi.org/debian trixie InRelease [54.8 kB]   
> Err:2 http://archive.raspberrypi.org/debian trixie InRelease
>   Sub-process /usr/bin/sqv returned an error code (1), error message
> is: Missing key CF8A1AF502A2AA2D763BAE7E82B129927FA3303E, which is
> needed to verify signature.
> Hit:3 https://pkg.cloudflare.com/cloudflared any InRelease
> Warning: OpenPGP signature verification failed:
> http://archive.raspberrypi.org/debian trixie InRelease: Sub-process
> /usr/bin/sqv returned an error code (1), error message is: Missing key
> CF8A1AF502A2AA2D763BAE7E82B129927FA3303E, which is needed to verify
> signature.
> Error: The repository 'http://archive.raspberrypi.org/debian trixie
> InRelease' is not signed.
> Notice: Updating from such a repository can't be done securely, and is
> therefore disabled by default.
> Notice: See apt-secure(8) manpage for repository creation and user
> configuration details.
>
> I replaced bookworm to trixie in file sources.list when I upgraded
> my system. The error message came out after upgrade completed. 

What do the following output?

dpkg --audit

dpkg -l libc6 raspberrypi-archive-keyring

-- 
https://www.greenend.org.uk/rjk/

--- PyGate Linux v1.5.2
 * Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)
SEEN-BY: 105/81 106/201 128/187 129/14 305 153/7715 154/110 218/700
SEEN-BY: 226/30 227/114 229/110 112 134 200 206 275 300 317 400 426
SEEN-BY: 229/428 470 616 664 700 705 266/512 291/111 292/854 320/219
SEEN-BY: 322/757 342/200 396/45 460/58 633/10 280 414 418 420 422
SEEN-BY: 633/509 2744 712/848 770/1 902/26 2320/105 5020/400 5075/35
PATH: 633/10 280 229/426