I filed a bug report in the debian bugtracker for that issue.
Now we just have to wait for debian maintainers to fix that and the changes can be merged back into ubuntu.
Meanwhile you can uninstall mono-xsp and mono-xsp2 should install fine, if you need both change the preinst script on your own and build a new package with the changes and install via dpkg -i.
I filed a bug report in the debian bugtracker for that issue.
Now we just have to wait for debian maintainers to fix that and the changes can be merged back into ubuntu.
Meanwhile you can uninstall mono-xsp and mono-xsp2 should install fine, if you need both change the preinst script on your own and build a new package with the changes and install via dpkg -i.
michael