[ubuntu] I can't install Ubuntu

Hello, I have a problem with the Ubuntu 12.10 installation. I’m trying with bootable USB stick. The install process starts fine but gets stuck after "Almost finished copying files". I’m trying to install it on DELL 1555 laptop. I tried several times but every time the same situation (12.04 as well :().

The hard drive is separated thus:
50GB ext4 /
~450GB ext4 /home
~1GB swap