[Bug 989372] [NEW] 12.04 usb drive boot graphic problems

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I am trying to boot from a USB drive containing 12.04. I created the
boot disk from 10.04. When I boot from the USB drive instead of seeing
the boot screen to select boot options (install, run from disc, etc.) I
see a black screen with a grey square in the lower left corner of my
screen.

If I cursor down to where install is and select the install screen
displays fine.

If instead I wait out the boot screen and the OS continues to load I get
a garbled screen filled with neon colored patterns, and nothing else is
viewable. If I right click or move the mouse around the screen there are
many changes in the patterns, but still nothing viewable except the neon
garbled mess. (however I can flip over to terminal and it works fine.)

I also had graphic issues with Natty and Oneiric, so have resorted to
reinstalling and staying on Lucid. Would really like to find out why
newer versions of Ubuntu (running Unity, though not sure if that is the
issue) do not work well on this laptop though, since it is not old and
is a pretty powerful laptop.

Dell Inspiron 1720 laptop
GeForce 840M GS graphics card
4GB Ram

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: bot-comment
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12.04 usb drive boot graphic problems
https://bugs.launchpad.net/bugs/989372
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