I'm still running kubuntu 10.10 on my computers (but is planned and update to 11.04).
Easy I have search on the web for this words "libreoffice apt" and many publications are there. Probably is not necessary, certainly is redundant, but even that I like to share that the update to libreoffice is as simply as:
sudo add-apt-repository ppa:libreoffice/ppa
sudo apt-get update
sudo apt-get install libreoffice
sudo apt-get install libreoffice-kde
Gnome users must modify a bit the last line.
Ps: With more than a month of silence, at least one small post to go back to the activity...