People with Intel 845 motherboards and onboard video drivers may face a issue if they login into system on Ubuntu 8.10. Also people running live CD may not able to actually run Ubuntu 8.10 as it will freeze in live CD mode. So people who wants to install Ubuntu 8.10 on Intel 845 must select the "install Ubuntu" option when booted from live CD instead of "Try and Install Ubuntu" option.
Once Ubuntu is installed on boot try to login if your login freezes then press reset button and wait again for login screen. At login screen select the "Fail safe Terminal" from session section from your lower left corner and login. Now type "gconf-editor" and once the editor is launched select the "desktop->gnome->application->window_manager" now from right side of window edit the values for current and default by removing "/usr/bin/compiz" with "/usr/bin/metacity" and then reboot.
Now from login screen again select the GNome session instead of "Fail Safe Terminal" and now login with your username and password.