I am having this problem too. I uninstalled the ubuntu-desktop package, the jaunty upgrade button appeared. I reinstalled ubuntu-desktop, and the error occurs again. There are consipicuous errors in the log file toward the end (attached).
I am having this problem too. I uninstalled the ubuntu-desktop package, the jaunty upgrade button appeared. I reinstalled ubuntu-desktop, and the error occurs again. There are consipicuous errors in the log file toward the end (attached).