Key is stored in legacy trusted.gpg keyring, see the DEPRECATION section in apt-key(8) for details

 Дано:

$ apt update
В кеші:1 http://raspbian.raspberrypi.org/raspbian bookworm InRelease
В кеші:2 http://archive.raspberrypi.org/debian bullseye InRelease                                                    
В кеші:3 https://download.docker.com/linux/raspbian bullseye InRelease                                               
Зчитування переліків пакунків... Виконано           
Побудова дерева залежностей... Виконано
Зчитування інформації про стан... Виконано   
1 package can be upgraded. Run 'apt list --upgradable' to see it.
W: http://raspbian.raspberrypi.org/raspbian/dists/bookworm/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.

"Ліки":

$ apt-key list | grep -A4 "trusted.gpg$"
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
/etc/apt/trusted.gpg
--------------------
pub   rsa2048 2012-04-01 [SC]
      A0DA 38D0 D76E 8B5D 6388  7281 9165 938D 90FD DD2E
uid           [невідома] Mike Thompson (Raspberry Pi Debian armhf ARMv6+VFP) <mpthompson@gmail.com>

$ sudo apt-key export 90FDDD2E | sudo gpg --dearmor -o /tmp/raspi.gpg
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).

$ file /tmp/raspi.gpg
/tmp/raspi.gpg: OpenPGP Public Key Version 4, Created Sun Apr  1 21:02:33 2012, RSA (Encrypt or Sign, 2048 bits); User ID; Signature; OpenPGP Certificate

$ sudo apt-key del 90FDDD2E
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
OK

$ sudo mv /tmp/raspi.gpg /etc/apt/trusted.gpg.d/

$ apt update
В кеші:1 http://archive.raspberrypi.org/debian bullseye InRelease
В кеші:2 https://download.docker.com/linux/raspbian bullseye InRelease                                              
В кеші:3 http://raspbian.raspberrypi.org/raspbian bookworm InRelease                                                
Зчитування переліків пакунків... Виконано        
Побудова дерева залежностей... Виконано
Зчитування інформації про стан... Виконано   
1 package can be upgraded. Run 'apt list --upgradable' to see it.