What software can I use to view .epub documents?
You can use calibre software for viewing .epub documents.
To install calibre from terminal:
sudo apt-get install calibre
Or click the icon below.
If you don't want to launch the full
calibre client just to view your ebook files you can add a
.desktop launcher to
calibre's inbuilt ebook viewer:
Create a new
Copy and paste the following passage into the file:
#!/usr/bin/env xdg-open [Desktop Entry] Version=1.0 Type=Application Terminal=false Icon=calibre Exec=ebook-viewer Name=Calibre Ebook Viewer Comment=Display .epub files and other ebook formats MimeType=application/x-mobipocket-ebook;application/epub+zip; StartupWMClass=calibre-ebook-viewer
Save the file. You should now be able to launch Calibre's inbuilt ebook viewer both from the dash and through the right click "Open with" menu.
I prefer Okular, a document viewer made for KDE. It has features including bookmarks and highlighting.
It's available in the main ubuntu repository and can be installed on a plain vanilla Ubuntu installation; kubuntu is not required.
To be able open epubs with okular, you must also install the okular-extra-backends package.
sudo apt-get install okular okular-extra-backends
Another useful option, try this in Firefox; https://addons.mozilla.org/en-US/firefox/addon/45281/, a fairly good extension for the Firefox web browser that lets you read .epubs from the browser, especially good since on Ubuntu you are likely to be using Firefox and it is usually kept open when you are using your computer.
MuPDF can read epub files, and is only 3 MB.
It may be too minimalistic for some, but I loved it! Way faster than xpdf!
sudo apt-get install mupdf
Coolreader 3 http://sourceforge.net/projects/crengine/ one or two pages, bookmarks, memory last reading pages, settings background, fonts, fonts color. Settings avilable only for root, but save for user. PPA https://launchpad.net/~vovansrnd/+archive/ubuntu/coolreader
Editor fb2 http://fb2edit.lintest.ru
Compared to Calibre and FBreader, I find Readium Chrome extension offers a much better user experience:
lucidor at http://lucidor.org/lucidor/download.php does a decent job. I completely removed calibre from my system because it doesn't let me leave the books in my own directory structure. (Then spent hours moving the thousands of books into a directory structure I like by hand.) I couldn't find coolreader to try. Okular I like but the extensions did not work on epub for me. fbreader works but you have to open it up first and then the book whereas lucidor you can right click from the file manager to associate epubs to lucidor.
Another option may be Ebook-Viewer, a GTK ePub reader. But it seems to lack DRM support.
If you care about UI/UX kind of thing, I recommend Foliate. It's neat and crisp.