I can't type in Arduino IDE version 1,1.0.1,1.0.5,1.5.5.

I can't type in Arduino IDE version 1,1.0.1,1.0.5,1.5.5. I can hit the enter button and it goes next line but the letter button doesn't. Version 1 I follow the FAQ to install but other version I download the tgz file then unpack and run Arduino file. I use Ubuntu12.04lts. What should I do?

Try File, Preferences and uncheck "Use external editor"

JimboZA:
Try File, Preferences and uncheck "Use external editor"

nothing change