I attempted to reproduce this issue using Ubuntu and Xubuntu Desktop images dated 2010-09-25. I can no longer reproduce this bug. The last Ubiquity dialog shows two buttons in Maverick Meerkat development version (10.10). When "restart now" is clicked, it immediately shades out to show something is happening. Also, a spinner is shown in place of the cursor.
I attempted to reproduce this issue using Ubuntu and Xubuntu Desktop images dated 2010-09-25. I can no longer reproduce this bug. The last Ubiquity dialog shows two buttons in Maverick Meerkat development version (10.10). When "restart now" is clicked, it immediately shades out to show something is happening. Also, a spinner is shown in place of the cursor.