我在配置pxe 启动ubuntu的时候报错：pxe-e53 no boot filename received
我的dhcp配置如下：
ddns-update-style none;
default-lease-time 604800;
max-lease-time 604800;
log-facility local7;
option subnet-mask 255.255.192.0;
option broadcast-address 10.1.255.255;
option routers 10.1.1.1;
option domain-name-servers 10.1.2.10,211.12.1.227,221.12.33.227;
option domain-name "qunhequnhe.com";
subnet 10.1.0.0 netmask 255.255.192.0{
range 10.1.32.0 10.1.33.254;
filename "pxelinux.0";
}
dhcp和 pxe位于同一服务器上，这台服务器安装配置好了dhcp和ubuntu，并且确定dhcp的基础工作正常，请问我应该怎么修改
