Errors

valid_signature
gpg: Signature made Fri 08 Jul 2022 07:06:06 PM JST
gpg:                using RSA key C2E15D4EF1D26573A85F25F03521A36D7CDCA07E
gpg: requesting key 3521A36D7CDCA07E from hkp server keyserver.ubuntu.com
gpg: Can't check signature: No public key
==> BAD/TAMPERED signature detected! <==