The only PDF viewer you want to use is here.
Over the years, I've used a lot of different PDF readers, and my opinion of them is pretty bleak. Most of them suck. I have a large collection of ebooks in PDF form, but I despise reading them because ...
Linux has quite a few PDF readers available, but Okular stands out as the best of the bunch, due to its ability to comment on, highlight, and otherwise annotate PDFs.
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