[DMcCunney]

Originally Posted by Gregg Bell

That's about it. The details: (I have Xubuntu 14.04.) I am a little confused. Xubuntu has an "E-book Viewer"in the graphics section of the applications menu. It's a great viewer. But then when I open up an epub to view in Calibre it comes up in the selfsame "E-book Viewer" from the graphics section of the applications menu.

So, #1) Is that "E-book Viewer" part of my default Xubuntu stuff or part of Calibre?

Calibre is available for Linux and OS/X as well as Windows. It's written in Python, which is cross platform. I believe what Ubuntu offers as eBook Viewer is in fact Calibre, and the menu entry is a link to the eBook Viewer portion of Calibre.

Then I need an Ebook viewer that will highlight. "E-book Viewer" will highlight stuff but when you go to highlight something else the previous highlighting disappears.

Why do you need to highlight?

I think that behavior is pretty standard. When you highlight something in an application, like an editor, it is setting marks at the beginning and end of the highlighted section, and displaying what you highlighted differently.

If you go to another place and highlight, it removes the old begin and end marks and sets new ones. Applications assume you will highlight one thing at a time, and if you highlight a new section the old one goes away.

So, #2) Is there a way to get "E-book Viewer" to retain the highlighting?

AFAIK, no.

And lastly #3) If "E-book Viewer" will not retain the highlighting, what is a good free Ebook viewer that I can get that will do highlighting?

You want to highlight multiple sections, have them displayed differently, and have the highlights retained for future viewings?

There is no eBook viewer that will do that. The closest you can come will be to create a bookmark for each highlighted section that you can return to in a future viewing. What you want would require editing the eBook file and placing highlighting marks at desired places in the text. eBook viewers can't do that.
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Dennis