This morning I decided to updgrade from 7.10 (ubuntu studio version) to 8.04 using the update manager. Partway through the upgrade, i got several error messages - one saying nautilus crashed and had to close, another saying the upgrade failed and the system may be in an "unstable" state. I tried restarting and updating again. Now, the update manager says that it can only do a partial update due to a previous update failing, and when try to run the partial update it crashes again.

Everything else seems to be working OK (I'm posting from the machine right now), but I seem to be stuck somewhere between 7.10 and 8.04. Any suggestions?