I am running Ubuntu 14.04 (32 bit) on Toshiba Tecra. I have tryied to expand the Dash window and I have got a crash and after, I cannot open anymore Dash because the screen fades and some scrambled colors appear on the top of the screen. The Dash button remains clear. Pushing second time the Dash button I can get the screed back functioning. But still no Dash working. Any solution, please?