Ubuntu on Lenovo B50-80 and Lenovo B51-80. Any problems with Ubuntu?

Hi, my current laptop is about to die and I was looking for a new one. I though about two Lenovo models:
- B50-80 with 5th generation intel processor AMD Radeon R5 M230
- B51-80 with 6th generation of intel processors, gpu RADEON R5-M330

Could you please give information about them in terms of compatibility with Ubuntu (14 o next 16). I'm specially interested in knowing if the GPU has drivers and works out of the box and where the brightness control works and the levels are stored (in my previous toshiba laptop with ati hd3470 I had to edit a file and manually set it, so I rather have it controlled through the FN keys).

Do wifi, bluetooth, 3.0 usb ports, etc work out of the box? Do I have to install drivers separately?

Any other info which you may find relevant.

I have a 250gb Samsung Evo 850 which I intend to install. A friend of mine has got the B50-80 and I know it's easy to install the SSD, but I don't know if it is easy to install the SSD on the B51-80. I suspect the have the same case, which is divided into several pieces which makes it easy to install the SSD (other laptops have a single piece as the back case which makes it more difficult and detectable by the guarantee).

Any help is much appreciated.

Thank you.