(Select desktop - Maté or XBMC)
UserID: ultimate
Passwd: <none> (Just hit enter)
As-Far-As-I-Can-Recall, that is. This has been consistent over several Ultimate Edition ISOs.
However ...
Some ISOs are designed to work
only when "burned" to plastic disc (ISO = cd-rom filesystem). Some
may also work when "dd"-ed to other forms of storage; destroying prior storage-structure, of course.
Sometimes there are cheatcodes (boot parameters) to facilitate booting from other file-systems, storage devices, or file-locations. (Discovery therof can be
challenging.)
Not every live-demo can find its own <body-part> with its own <appendage>
.