Basically, it's dropping to shell.
It does this when some fatal error happens - which will appear on the lines immediately before what you posted.
The same symptoms cropped up on some systems with 9.04 as well.
... foil to boot from install media ... the workaround was to remove and reinsert the media very quickly.
Did you install and get this error on boot, or do you get it when you attempt to boot from the install media?