i have a old laptop with 10.1 screen size ,it doesnt have a CD driver and it cant boot from external cd drive or USB even i made a bootable USB and tried to boot it using GRUB and it didnt work any way ,from two years i took the hard drive from it and installed ubuntu 8.04 it worked great until i upgrade it to 10.04 ,the screen size is 800*400 it is too bad so i want to install Debian 6.0.6 using the exist ubuntu (with out booting)
i mean could i start install debian by using termial of ubuntu 10.04 (we use a ubuntu installer on windows if we want to install ubuntu on windows laptop could use this way on ubuntu
please help

Essentially, no. WUBI is, as far as I know, unique.

Have you looked in the BIOS to check what sources the laptop can boot from? It might just be that the hard drive is set to boot before the USB ports...

It you have linux on it, you can load on a new linux. It is much more complex, more like a LFS install or an old Knoppix hard drive install.

I have heard of other users getting a wubi install to move to a flash drive and using other distro's so it would be possible to use wubi to run some other distro's.

May be possible to get a grub4dos to load an iso.

May be possible to pxe it or gpxe/ipxe it from a floppy to almost any OS.

Might be possible to get a floppy install to network.

I have use floppies to boot to a shared cd on network.

Also one might use something like G4U to move a qemu/vm built image over.

Should be possible to take the drive out and load it on a usb external and move it back.

I'm sure there are other ways.

well if you know how to use GRUB way of boot using bootable flash disk please help

Sorry, can you currently boot with a USB drive or not? If you can, then it shouldn't be any different to installing from a CD...

If you resize your windows partition you may be able to use debootstrap thru your existing install. I haven't tried from a Wubi install but I believe it will work.
http://wiki.debian.org/Debootstrap