removing ubuntu

i currently have dual boot system linpus lite and ubuntu 8.10.

is there an easy way to remove ubuntu from the system a have just linpus on it without wiping out the linpus OS.

i was just thinking of just booting into ubuntu liveusb and then using gparted to remove the ubuntu partition and resizign the linpus one to full size, the only problem i can think of is grub, how to i restore grub to the original configuration.

any ideas

Thanks