Neil, thanks for providing the extra info. From your apt.log it looks like the upgrade actually proceeds to completion. There aren't any obvious errors it just fails to exit. If you can reproduce the bug reliably then an strace as per Micheal Vogts request would be a big help
Steve, I think your bug may be a separate issue that happens to have similar symptoms. Your log files are quite different to the others in this thread.
Neil, thanks for providing the extra info. From your apt.log it looks like the upgrade actually proceeds to completion. There aren't any obvious errors it just fails to exit. If you can reproduce the bug reliably then an strace as per Micheal Vogts request would be a big help
Steve, I think your bug may be a separate issue that happens to have similar symptoms. Your log files are quite different to the others in this thread.