Comment 138 for bug 204996

CLUE!:
Upon downloading/installing from 7.10-8.04 LTS using package manager my system froze (first time) during the cleaning up old packages step! My theory and it might be completely off but there could be (only works when upgrading from package manager) an old package that conflicts with a newer package and the kernal or what ever reads the package is not understanding which to use or how to use it and panicking. I had to turn power off from on switch (or hold down button) and it did not finish cleaning up system this could also be a script that didnt get cleaned up im not sure, maybe someone with more time on their hands could look into this more deeply?
Hope i helped anyway :)