There are a lot of pdf readers available for ubuntu; evince, kPdf etc. The 2 noteworthy pdf readers i will be mentioning here are : Foxit reader and Adobe reader. Each has its pros and cons and the choice depends on your interest, inquisitiveness and productivity consciousness.
If you want a simple,light-weight and fast loading application, i recommend Foxit reader.However if you prefer a reader with good rendering and quality, i suggest Adobe reader which releases an updated .deb version for Ubuntu corresponding to its Windows equivalent, as opposed to Foxit.
Try it yourself :
Download the .deb Foxit reader package for Ubuntu here (3.4 MB approx).
Download Portable Foxit Reader for Linux/Ubuntu here .
Download Adobe Reader for Linux here (43MB approx).
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