Whilst EVINCE is a very capable PDF Viewer, if you have a need to fill in editable PDF forms it is required to install the Adobe PDF Reader.

sudo add-apt-repository "deb http://archive.canonical.com/ precise partner"
sudo apt-get update
sudo apt-get install acroread

PS: If anybody is aware of an Open Source alternative to the Adobe Reader for editable form please leave a comment !

When you need to convert multiple documents to PDF for distribution (or from one Office format to another) there are a few utilities around. The most workable I found is the UNOCONV utility which is build on top of LibreOffice / OpenOffice. This uses the OpenOffice conversion facilities rather than a simple PDF print driver.

On Ubuntu it can be installed via Software Center or via apt-get from the core repositories.