To provide some help with trying to resolve, please refer to bug 571743 , system upgrade 9.10 --> 10.04 could not calculate upgrade when both xubuntu-desktop and ubuntu-desktop are installed .
To provide some help with trying to resolve, please refer to bug 571743 , system upgrade 9.10 --> 10.04 could not calculate upgrade when both xubuntu-desktop and ubuntu-desktop are installed .