Ubuntu 9.10 Karmic koala comes with Open office 3.1 . The current stable version of OO is 3.2 . You can very easily upgrade your system to OO3.2
a) Grab the installation file from http://download.openoffice.org/ . A deb file is available as OOo_3.2.0_LinuxIntel_install_en-US_deb.tar.gz . Download it .
b) Unzip and untar it to make a proper deb
$ tar -xzvf OOo_3.2.0_LinuxIntel_install_en-US_deb.tar.gz
This will create a folder named OOO320_m12_native_packed-1_en-US.9483.
You will see several other folders inside it. The deb files for OO3.2 is in OOO320_m12_native_packed-1_en-US.9483/Deb folder
c) Remove the current OO installation
$ sudo apt-get remove openoffice*.*
d) Install OO 3.2 debs
$ cd OOO320_m12_native_packed-1_en-US.9483/Deb
$ sudo dpkg -i *.deb
e) Finally install OO 3.2 menus
$ cd /desktop-integration/
$ sudo dpkg -i openoffice.org3.2-debian-menus_3.2-9472_all.deb