Ubuntu 10.10 startup error

I download Ubuntu 10.10 Maverick Meerkat ISO file. I burn it in a pen drive with "Startup Disk Creator". Restart Computer. I changed booting disk. Start from Ubuntu10.10 installed pendrive. Everything seems ok and exiting, but suddenly. Yes, suddenly whole screen goes black and giving me an Error message. I am publishing it below:

(process:335): GLib-WARNING**: getpwuid-r(): failed due to unknown user id(0)

Then Ubuntu startup hang. Nothing happen. I wait for a long time. But machine did not response. I don't know what thing should do now. I am searching for a solution. When I got a perfect one, then I must share it with you.