Errors

valid_signature

gpg: Signature made Sat 31 Oct 2026 03:25:00 PM JST
gpg:                using RSA key D4B51BBA1CE761BE5B9112C3F05F82CA6E31369D
gpg: requesting key F05F82CA6E31369D from hkp server keyserver.ubuntu.com
gpg: Can't check signature: No public key
==> BAD/TAMPERED signature detected! <==