Having the same problem on a Dell M1330 & Dell Latitude XT.
I booted in debug mode and got the casper.log and dmesg (attached).
Appears to not find /dev/sda, when I look at the system from the BusyBox
prompt there is in fact a /dev/sda and /dev/sda1
** Package changed: linux (Ubuntu) => casper (Ubuntu)
** Changed in: casper (Ubuntu)
Importance: High => Critical
** Changed in: casper (Ubuntu)
Status: Triaged => Confirmed
** Changed in: casper (Ubuntu)
Milestone: None => ubuntu-9.04
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9.04 RC does not boot from usb disk
https://bugs.launchpad.net/bugs/363038
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