This is pretty simple in the linux mint. (You usually already have OpenOffice.org 2.4 which comes by default, so this is more like an upgrade procedure)
You add the OpenOffice deb repository as this is not yet available from Ubuntu reps and do a mintUpdate which will quickly tell you what is ready to be updated. Here we go.
Step 1 – Add openoffice.org repository. To do this first open Synaptic Package Manger, Go to Setting>Repositories. Click new which will add new repository at the end of list. Add the following details as shown in screenshot for the new repository entry. Then press ok to save.
Step 2: Open mintUpdate (Menu>Administration>mintUpdate) and click on Refresh, Which will now show all the updates for open office. Click installl updates
I appreciate your blog and the info on the Open Office upgrade for mint. Only one problem: I can’t read your screenshot for the repository entries data. When I zoom it gets blurrr. Help!!!
Try clicking on the images, you will get the bigger versions.. or you can use the following link
http://blog.chintoju.com/wp-content/uploads/2008/12/add-repository-mint1.png