Many people have asked me about this, so let me point to this wonderful piece of documentation on Ubuntu Wiki.
[:https://wiki.ubuntu.com/InputMethods/SCIM/Setup]
and if you're still stuck wondering why GTK IM Module isn't working for you on OpenOffice, there's [:http://www.scim-im.org/wiki/faq/gtk_gnome/why_i_can_not_input_with_scim_under_openoffice_oo|another] [:http://www.scim-im.org/wiki/documentation/installation_and_configuration/all/system_configuration|wonderful piece of documentation] for you.
