If you're looking for an e-book reader in Linux, Foliate (https://github.com/johnfactotum/foliate/) is the best I've seen. I used to be a fan of Calibre E-book reader and had my own custom CSS for theming, but the redesigned e-book reader (I think it was Calibre 4.0) completely broke my setup. I don't know how it is these days, but it was extremely buggy and lagging when I tried some months ago. Even Bookworm (https://github.com/babluboy/bookworm) is a far better alternative than Calibre E-book reader.
I also thought it was from Times of India initially