I've been trying to upgrade from 11.10 to 12.04 using the update manager. Everything went fine at first, and I haven't gotten any errors, but the progress has been stopped at "Preparing to configure debconf" for about 24 hours now. Is there anything I should do about this or a way to stop the upgrade?
I ran into the same issue. In my "Distribution Upgrade -- Upgrading Ubuntu to version 12.04" window I had a >terminal. I opened that and I had to say OK to something about stopping services. (I didn't know it was going to work, so I didn't write it down for later reference, so I cannot quote exactly what it was.) Anyway, after I OKed it, the install continued.