Is it possible that mepis 12 has ubuntu as base ?
No way: no one here wants it, starting with Warren.
I wouldn't say "no one". ;-)
I was in the minority back in 2006 when a survey thread was started with votes on using a Debian versus Ubuntu base (you'll find my post favoring Ubuntu versus Debian posted on January 28, 2006).http://www.mepis.org/archives/node/8941?page=1
My experience then was that hardware that worked in the latest versions of Ubuntu did not work in the latest version of Mepis or Debian stable.
I'm still seeing that today, where you have to "jump through hoops" if you want support for the latest software versions and hardware using Mepis (despite the efforts of the community) without more effort than a typical user would want to exert, versus just loading Ubuntu/Kubuntu or other derivatives to easily have access to the latest software.
For example, I installed Kubuntu 12.04 in VirtualBox (using a Mepis 11 host) yesterday, and it only took me a few minutes to "tweak it" to taste (installing the Elegance Theme like Mepis uses by default, changing the wallpaper, installing a different menu launcher, and adding a few apps I use more often). Here's a quick screen capture I just made while typing this post:http://dl.dropbox.com/u/4536228/kubuntu1204_1.jpeg
Based on how well it works with my limited usage since downloading and installing it in a Virtual Machine yesterday, I'll probably install it to the hard drives on my desktops and laptops soon, too.
I use Mepis primarily, mostly out of loyalty, since I found the early Mepis versions to work best, and I like the community efforts to offer newer versions of software for it now. But, personally, I find it frustrating that I can easily install other distros and get newer kernels, newer software, etc., without as much effort. I also find it difficult to recommend Mepis to new users, since I realize that it's not as "polished" in many ways (associations for default apps that load, etc.), and has a more difficult learning curve compared to some of the other distros around (especially when installing new software, setting up the repos and more to get best results).
I've also found that distros using Debian repos are less stable with updates breaking things more often. I wouldn't use the Debian spin of Mint for that reason, and I have breakages on a regular basis with the community repos enabled in Mepis, too. I'm just used to them enough that I recover from them and go on. But, I wouldn't expect a new Linux user to tolerate that kind of thing.
So, my vote would [still] be to use an Ubuntu base, so that newer drivers, kernels and apps are easily available (with a lot more users testing them) without the problems associated with using to stick with a Debian base using community supports updates to get newer versions of stuff you want.