minisignPubkey := env.Get(envMinisignPubKey, defaultMinisignPubkey)
	if minisignPubkey != "" {
		v := selfupdate.NewVerifier()
		u.Path = path.Dir(u.Path) + slashSeparator + releaseInfo + ".minisig"
		if err = v.LoadFromURL(u.String(), minisignPubkey, transport); err != nil {
			return AdminError{
				Code:       AdminUpdateApplyFailure,
				Message:    fmt.Sprintf("signature loading failed for %v with %v", u, err),