This bug is from 28 Nov 2007.
So I can not reproduce it.
The only what I can do for you is the Thread http://forum.ubuntuusers.de/topic/distributions-upgrade-haengt/ . But it is in German language and not all Screenshoots are online at this time.
I'm afraid after one year the causals of the bug can not be detected.
(Sorry for my englisch).
This bug is from 28 Nov 2007.
So I can not reproduce it.
The only what I can do for you is the Thread http:// forum.ubuntuuse rs.de/topic/ distributions- upgrade- haengt/ . But it is in German language and not all Screenshoots are online at this time.
I'm afraid after one year the causals of the bug can not be detected.
(Sorry for my englisch).