Unable to boot from usb

[tsh]

I'm trying to install on a machine without a cd drive. Just used a machine with a new install of 10.4 to make a notable usb (8Gb). It boots to the ubuntu display, then nothing. Escape shows
Glob-WARNING getpwuid_r() failed due to unknown user id (0)

Ideas?

[C.S.Cameron]

What did you use to make the bootable flash drive, UNetbootin? usb-creator?

Have you checked the MD5SUM of your downloaded iso?

Corrupt iso's have kept me entertained for hours.

[tsh]

I used the 'startup disk creator' (sub-creator-gtk, I think). Just taken me a while to find the md5sum, but that's OK.

No longer a pressing problem, I found a cd drive in the loft - but I'm guessing its not just me!