I did the following trick: http://junkypc.com/enable-dual-core-processors-ubuntu/ But after that when I was trying to shutdown the system it seemed like shutting down forever so I had to use forced shutdown by holding power. The problem didn't dissappeared so I had to restore the lines "currency=shell" to "none" as it was.
It's shutting down properly. But I'd be really glad if my first netbook with my first Ubuntu would work faster. I have installed 32bit version due to low capacity of my ssd (16gb). Can anyone help me? Thanks in advance and my regards for all linux community :)