The new version of Mono not include the bin installer. Is deprecated because the Mono Team want people responsable of Linux distros make the changes needed to run the FrameWork on the distro.
So the article how to run ASP.NET 2.0 websites on Mono is out of date.
At now Mono don't support LoadViewStateModeByIdAttribute, this is used by Panel Gaia WebControl. The base of a lot of stuff, and needed to make ForceAndUpdate.
In this moment, Mono not support 100% Gaia Widgets. The base to run Gaia is not use the controls using LoadViewStateModeByIdAttribute, unfortunally Panel, ExtendedPanel, TreeView and some others are using it.
Yo only can use Gaia on Mono with simple controls, so the power of Gaia is short in Linux.