Nihon-go de Kakenakute Suimasen.

Hello, I booted Ubuntu from USB Pendrive, but just as it gets to show the desktop, the screen shows nothing but few "shaggy" lines. It makes the start up sound thing, but the desktop doesn't show up. I have followed these steps written in this:

https://wiki.ubuntu.com/LiveUsbPendrivePersistent

I can't take a screen shot so I don't know how to explain it very well, but I think it boots up fine, (it shows some errors and file not found in the boot up, but its the same with LiveCD that I have it booted right now, and its working fine).

Thank you