Hello Luis and everyone else reading.
I just discovered YACReader and promptly installed it after reading it's GPL licensed and available for Linux and Ubuntu specifically. Good readers are actually rare for Linux. There's Comix, but its library is pretty much non-existant. Also it's not in development any more since ages.

YACReader runs pretty smooth on my rather old hardware: Ubuntu 14.04., 2x2,2 GHz, Nvida GeForce 8600GT

Its library is also very nice. I was surprised how well it automatically scanned my folders.
Though there are a few features I miss for the library. I think I'll create a thread for my suggestions next if there isn't already one.

I'll also donate a few Euros. I can't give much, but I might add to it every now and then.

Welcome Chocwise!
It's nice to see a fellow Linux user who also likes to read comics. Funny that you should mention Comix, I used to read my comics with that one and it's fork mcomix that's still in development for quite some time.
YACReader's strenght is that it's very intuitive to use and has a very nice performance compared to *comix, especially with large files.

What I noticed, is that YACReader encourages you to virtually grab a book and actually start reading. You browse through the library and see all the nice covers. It reminds you of stuff that you don't really realise you had, when you just used the folder view of your file browser.

Chocwise wrote:
That is the idea