I don't know how long it usually takes since this is the first time installing, however, when the progress bar stops during deployment of Ubuntu, it takes about 3 minutes to complete. I just downloaded again from Google and I got weird filenames, which I installed with the same results.
Do you get an error or just a blank screen? Can you adb shell after about 30 seconds later?
If no, format data and system and just install the system cm-10*.zip file without the rootfs..
Can you adb shell now?
Filenames should be...
I still haven't checked... will soon..