Install Acrobat Reader
For many purposes the default pdf/ps viewer evince is very good. However, I find that sometimes Adobe Reader is needed. Following the instructions here, the install is accomplished by the following commands (execute each line seperately):
sudo apt-add-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner" sudo apt-get update sudo apt-get install acroread
Type acroread at the dash home to find Adobe Reader — no desktop icons will be installed. Once open, you can lock to the launcher if you like.