Have you been asked to provide a particular document not only in PDF format, but specifically in PDF/A? You are in luck as you can easily create PDF/A with LibreOffice.
As you probably know, PDF is a standard for encoding documents that is portable between systems. Then, if you are wondering how PDF/A differs from “conventional” PDF, according to Wikipedia:
OpenOffice
Install LibreOffice on Ubuntu using the official repository
Few days ago the final version of LibreOffice 3.3, the spin-off of OpenOffice born after the the issues between Document Foundation and Oracle, come to life.
With this guide I will show you how to install LibreOffice 3.3 on Ubuntu and its variants with the official repositories.