What can't you load and on what??? To paraphrase, you need to provide a lot more info on the hardware and the version of Ubuntu that you use.
how to reinstall Gnome Display Manager?
it fails as i see.
Ok, newermind -- started reinstall
There are two messages for Gnome display manager. One message says OK. Then two lines later the second message says FAIL. You may have two instances of Gnome display manager installed.
It is a machine. It is more stupid than we are. It will not stop us from doing stupid things.
Ubuntu user #33,200. Linux user #530,530