Originally Posted by john64
two hard drivers (C; 80gb and G:40 gb )
C and G are not actually hard drives. They are partitions.
You probably should figure out what D, E and F are before doing anything to "G". I expect one of D, E or F is a CD or DVD drive. Do you know what the others are?
Linux does not name hard drive partitions (nor CD/DVD drives) the same way windows does.
Linux probably names your hard drives sda and sdb, then names the first partition of each sda1 and sdb1.
my question is how can I install Linux unbunto 8.0 in the G unit without uninstall windows xp in the c unit
There are many
ways to set up a dual boot. The simplest to use and simplest to install (pretty much the default in the Ubuntu installer) is to let Linux take over the MBR of the first hard drive for the Grub bootloader. The Ubuntu installer will automatically create entries in Grub to allow chainload of Windows.
With Windows on the first drive and Linux on the second, that means the MBR on the first drive is set to load Grub from the second drive, then Grub is set to offer you a choice of chainloading Windows from the first drive or directly loading Linux from the second.
As I said before, that is easiest to use and easiest to install. It is not easiest to uninstall. If you wanted to remove Linux, you would need to first run the fixmbr program in Windows to get Windows to take back the MBR of the first drive. Other forms of dual boot are harder to install and in some forms also harder to use, but wouldn't need fixmbr if/when you remove Linux. I prefer the default choice, needing fixmbr. But I wanted to tell you that there are choices.