Comment 45 for bug 334101

update-manager has this code enabled. It automatically gets the latest fglrx-modules.alias.override from fglrx-modaliases and checks against that. If fglrx is in use and no longer supported it shows:

_("Upgrading may reduce desktop "
                                         "effects, and performance in games "
                                         "and other graphically intensive "
                                         "programs."),
_("This computer is currently using "
                                         "the AMD 'fglrx' graphics driver. "
                                         "No version of this driver is "
                                         "available that works with your "
                                         "hardware in Ubuntu "
                                         "9.04.\n\nDo you want to continue?"))
and if the user accepts it will remove fglrx and rewrite xorg.conf to use "ati" instead.