Get:1 http://ftp.debian.org/debian buster InRelease [122 kB]
Get:2 http://ftp.debian.org/debian buster-updates InRelease [51.9 kB]
Err:1 http://ftp.debian.org/debian buster InRelease
  gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
Err:2 http://ftp.debian.org/debian buster-updates InRelease
  gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
Reading package lists... Done
W: GPG error: http://ftp.debian.org/debian buster InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://ftp.debian.org/debian buster InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ftp.debian.org/debian buster-updates InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://ftp.debian.org/debian buster-updates InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.