I also did not change the gdm theme in karmic. After my initial upgrade from karmic -> lucid on 2010-03-05, gdm had switched over to the new theme. At some point shortly thereafter, a dist-upgrade reverted that change and I was left with the karmic gdm theme.
I also did not change the gdm theme in karmic. After my initial upgrade from karmic -> lucid on 2010-03-05, gdm had switched over to the new theme. At some point shortly thereafter, a dist-upgrade reverted that change and I was left with the karmic gdm theme.