#4 mono-classlib-1.0 not found

[Anonymous]

Hi !
(Ubuntu 7.04, up-to-date, french)
When installing Alligator 0.5.0-1 from sourceforge-downloaded .deb, my "gdebi" says "Error:Dependency is not satisfiable:mono-classlib-1.0"
When I try to install it with synaptic, it says that no version of this package is available, but exists within the database. (follow a list of packages). could you please tell me which package is required to replace mono-classlib-1.0 ?
Of course, I tried to find it through depots, but nothing seems to match...
Thanks in advance !
d.wendlinger@gmail.com