Err:17 http://mirrors.bwbot.org stable InRelease \ The following signatures couldn't be verified because the public key is not available

[kimariterikishi]

Debian 12 (according to the new method of including the GPG key, because "apt-key deprecated")

wget -O- http://mirrors.bwbot.org/dists/stable/Release.gpg | gpg --dearmor | sudo tee /usr/share/keyrings/bwbot.gpg > /dev/null

stdout:

Err:17 http://mirrors.bwbot.org stable InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 50B2C005A67B264F
Fetched 4678 B in 2s (2705 B/s)
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.bwbot.org stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 50B2C005A67B264F
W: Failed to fetch http://mirrors.bwbot.org/dists/stable/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 50B2C005A67B264F
W: Some index files failed to download. They have been ignored, or old ones used instead.

Mirror list:

deb [arch=amd64, signed-by=/usr/share/keyrings/bwbot.gpg] http://mirrors.bwbot.org/ stable main
deb-src [arch=amd64, signed-by=/usr/share/keyrings/bwbot.gpg] http://mirrors.bwbot.org/ stable main

For all other applications taken from an external mirror, the method is good.

Please fix it for the Systemback application too!