This is a old bug report (2008) but I think I got the sample problem today 
(2012)... and maybe I can help with details about the problem.
I download Ubuntu image "ubuntu-12.04-desktop-amd64.iso" e wrote it on usb 
pen-drive, under Windows 7, using tue recommended software 
"Universal-USB-Installer-1.9.0.4". I did like this: 
http://www.ubuntu.com/download/help/create-a-usb-stick-on-windows.
I got no (unexpected) problems booting from the first boot menu option "Run 
Ubuntu from this USB". Just my usual LCD back light problem that I am familiar 
with.
Because of this known problem I need to set "nomodeset" at startup in order to 
turn my LCD screem lights on... 

So I went to "Help" menu item... and in the "Help index", I pick "<F6> Special 
boot parameters for special machines".
It shows this at the bottom:
   "For example:
      boot: install vga=771 noapic nolapic"

No matter if a try the comand in the example or my own "boot: install 
nomodeset"... I always get the same error:
    "could not find kernel image: install"

Well, then I burn the same image on a DVD-R media, check "nomodeset", in
the boot menu options, and every thing works fine then.

I known that this information maybe not enough to find the problem, so you van 
ask me for any other info or propose a test. I'm a programmer so it will be no 
trouble.
Thankx.
Gabriel C. Stabel.

** Changed in: systeminstaller (Ubuntu)
       Status: Invalid => Confirmed

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https://bugs.launchpad.net/bugs/205349

Title:
  install from usb

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