Confirmed, xsp does not install in edgy.
The following packages have unmet dependencies.
mono-xsp: Depends: mono-xsp-base (= 1.1.15-1) but it is not going to be installed
E: Broken packages
** Changed in: xsp (Ubuntu)
Status: Unconfirmed => Confirmed
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xsp uninstallable on mono > 1.1.14
https://launchpad.net/bugs/55433