There are excellent PDF readers editors and writers native to Linux Adobe no longer supports Adobe Reader for Linux. Most Linux desktop distros include Atril which is the default reader ed to the file manager (Caja is the one included with Ubuntu). Inkscape the vector graphics editor LibreOffice Draw and The GIMP will all load PDF files and even allow editing the content. PDF was developed by Adobe and is the core feature of their product lines but the PDF standard is totally open so there are many open-source solutions for reading writing and editing PDF documents.