[Mono-aspnet-list] installation of mono ASP.NET in ubuntu 8.10

[senba]

$ sudo apt-get install mono gtk-sharp gtk-sharp-2.0 monodevelop
mono-classlib-2.0
[sudo] password for senba: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package mono is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package mono has no installation candidate

wat should i do i.ve downloadeed the package and also configure doesn't
work.......
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