When I do the last update system stop in Grub's "bash-like" screen.

[Saul.Lima]

Clean Install works perfectly, but with last updates can't boot Ubuntu 10.04. On my notebook the system stop in the Grub's "bash-like" screen.

I reinstall the system ans all works well. When I upgrade the system again, the same problem return. How can I boot on my system again?

I install Ubuntu 10.04 AMD64