I had Ubuntu 8.10 installed and I wished to upgrade to the beta. It worked but some packages weren't update for some reason.

I also changed the hard drive from ext3 to Ext 4 and was booting all well.

Today from the terminal I entered sudo apt-get upgrade -y to get the latest updates. Once finished downloading and installing a restart was requested. Now when going to boot after the grub menu is shown it wont' continue to boot. help please