[all variants] pre-built images username & password

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http://ubuntuforums.org – I've downloaded several ARM (armel - omap4) prebuilt/preinstalled images: ubuntu precise, kubuntu precise and older ones, but always having the same problem. I can not login. Only in the ubuntu precise alpha-2 I got to login as guest, but couldn't do anything else since I needed the root passwd for installing whatever... Could someone tell me what is the default or initial login or password for those images? ubuntu/blank or kubuntu/blank doesn't work, nor temppwd, admin, root.... do. the md5 seems to be correct (Hardware)