Display too shaky, nothing for 10 fingers or Ubuntu Linux.

I bought the computer in March 2012 at the Media Markt with i3-2350 CPU, where it was very cheap.
The display is too shaky and makes the long time a very uneasy feeling.
For ten-finger-Schreiber, the touchpad is too large. With your right hand you often ensures that the cursor falls somewhere at a different point in the text, which you write salad.
In Windows 7, I can not complain, however, too much software was installed and the software is too much automatically.
Under Lubuntu (LXDE instead with Unity interface) 12:04, 12:10, and 13:04. go not the volume and screen brightness keys. A trial basis pickled boot CD (12:04 on CD, 13:10 CD image on a USB stick) brought here but no positive Erebnis.
On Windows, otherwise everything OK

Due to the great instability (shakiness) of the display I would advise against. A friend had a broken display after 14 months with a 17-inch laptop from Samsung. Guarantee was not an option, a whopping 240 Euronon cost repair.