install/vmlinuz not found while booting from USB.

HI all,
I tried to find resolution to this problem by searching all forums but could not find any, hence creating new thread.

I am downloaded ubuntu-12.04-desktop-amd64.iso and trying to install it from USB as per instructions given here

http://www.ubuntu.com/download/help/...ick-on-windows

I am trying to boot system from USB to install it but I am not getting a screen where we need to choose "try ubuntu" or "install ubuntu".
I am able to select lang. but after that I am getting an below error.
"install/vmlinuz file not found".

from whatever I have got it might be related to some graphics card driver, but not sure though.
My system specifications"

Manufacturere : Dell
Model : Inspiron N5010
Processor : Intel(R) Core (TM) i3 CPU M330@2.13 GHZs
RAM : 4 GB
System type : 64 bit
ati mobility radeon hd 5470

Kindly let me know what could be done to resolve this issue.

same here, except I am trying to install on an AMD 64 machine.

we can't be the only ones, did you ever figure it out?

Wow, like a tomb in here these days.

I decided there is something wrong with the AMD64 12.04 ISO currently available for download.

Downloaded it twice and could not get a boot from either optical or USB media on 2 different machines. 11.10 and 12.10 both work fine.

Went ahead and put 12.10 on, can't say I like it much, what is with the advertisments built into the GUI?

I hear arch is nice this time of year