installing 10.10 notebook problem

Did you MD5 test the ISO you downloaded?
If you are using a CD did you check the CD for consistency and did you burn it as slowly as possible?

yes i did md5 test, and i am using usb stick

Ok test you RAM using the USB stick.

dont know how to do that ?

When you start booting from the USB you will see a keyboard and stickman screen. Press SPACE and select the Memtest

mem test said pass complete, no errors

Ok good so far so we know RAM is good and the install media is ok. What make / model netbook do you have?

it says no root file system is defined, please correct this from partitioning menu?

fujitsu siemens amilo ui 3520

Try adding the boot option:

acpi=off

may help

sorry dont know how to do that either?

Nobody is born knowing, if you'd websearched a tiny bit you would have easily found this:
https://help.ubuntu.com/community/BootOptions

HTH

that didnt work either :(

boot of your usb stick and run the trial version.
go into terminal by pressing CTL+ALT+T
then type

sudo fdisk -l ( that's a hyphen followd by a lowercase L)

copy and paste the output here

Did you use manual partitioning ?

this is what it said....

ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 60.0 GB, 60011642880 bytes
255 heads, 63 sectors/track, 7296 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xca27e68d

   Device Boot Start End Blocks Id System
/dev/sda1 * 1 7295 58597056 7 HPFS/NTFS

Disk /dev/sdc: 8036 MB, 8036285952 bytes
229 heads, 20 sectors/track, 3427 cylinders
Units = cylinders of 4580 * 512 = 2344960 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot Start End Blocks Id System
/dev/sdc1 * 1 3427 7845888 c W95 FAT32 (LBA)
ubuntu@ubuntu:~$

And there was no option to manual partition it just went straight to allocate drive space.

The 60GB disk sda is used at half so Ubuntu installer (Ubiquity) should have detected free space and proposed you to use this part of disk. You could do a "manual partitioning" during installation. Allocate size of RAM to a swap partition and remaining to an ext4 partition, on which you mount "/" folder.

sorry dont know how i would do that

During installation, you should at one step choice between:
   1-use whole disk
   2-install alongside Windows
   3-manual partitioning
Choose manual partitioning.
Then select free space and create a swap area of size of your RAM.
Then with remaining space create an ext4fs partition. You will see a menu with a lot of folders. Choose "/".
The second link I'm providing seems to be clear enough.

https://help.ubuntu.com/community/HowtoPartition
http://www.basicconfig.com/ubuntu_desktop_manual_partition_guide