preseed file did not work in pxe isntallation

[richard_wu0313]

hi forks,
i created a preseed file to auto install ubuntu10.10 x64 image, but these config in preseed file seemed not working. i only listed some items such as setting language, keyboard, time and son

d-i debian-installer/locale string en_US

d-i netcfg/get_hostname string xxxxxx
d-i netcfg/get_domain string xxxx

d-i clock-setup/utc boolean true

d-i time/zone string US/Central

any idea? thanks!