I personally use Zathura, it’s minimalistic and uses VIM bindings.
But if you want something feature-dense, with a way of organising your library, eReader integration, file converting and more, Calibre is pretty amazing (and the actual reader part of Calibre is quite nice to use in my opinion).
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Did you add the pdf to your Calibre library and open it or did you open it from somewhere else?
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Maybe try opening Calibre proper and adding the pdf to your library first? It should work the way you’re doing it, not sure why it’s hanging like that - unless there’s a problem with your Library location?
I use Okular from the KDE suite and it can literally view everything you can think of
There is also okular-mobile that is optimized for touchscreen use, it’s a bit buggy but it works
For Android, the ReadEra app, because it’s the only darn ebook app I could find that allows a scrolling mode instead of page flip. And you can add the Twilight app also to change screen temp, and extra dim mode in the dark. It works really well.
For e-ink ereaders, I don’t know what the best one is right now. Definitely not Kindle though. And Kobo has overdrive library integration. But e-ink in general is very nice for reading. Definitely go for 8 inches or more in screen size though if you want to read manga. Also physical page turn buttons are really nice.
Personally I use SumatraPDF.
Can read both PDFs, ePubs and even the djvu format. And its really lightweight, unlike the bloated monster that is Adobe Reader.
Same - for Windows it’s by far and away the best PDF reader for me. It’s shocking how far down the bloat rabbit hole Adobe Reader has gone!
I used to use Foxit on Windows. I’m on Linux now, and I cannot recommend Okular enough.
I hate to say it because I am a Cinnamon/Gnome/GTK guy, but I think Okular may be the best Linux reader. I think it can do form filling too.
For normal use I use Firefox, but if I needed something different Okular is one place I would look pretty quickly. I have used it in the past for more tricky things. Well I’d probably look evince and be disappointed first, then move on to Okular.