Need help reinstalling X.Org 7.4

[Verdugo]

Can someone help me reinstall xserver 7.4? I had upgraded to a beta version of 8.10 and it messed up the xorg.conf because I have an ati video card. I had read that I needed to downgrade xserver at the time to one that was supported. I was able to remove xorg 7.4 but since can't access the internet from the root shell I don't know how to reinstall xorg from the live cd. I would greatly appreciate any help on this because I don't want to resort to a full reinstall of Ubuntu. Basically, I can only access the shell from the recovery mode. Thank you to anyone that attempts to help me.

[Partyboi2]

You could try booting the live cd and using chroot to install xorg. This would require you having a working internet connection while using the live cd.
Open a terminal (Applications>Accessories>Terminal)

sudo mount /dev/sda1 /mnt *change /dev/sda1 to correct one, if not sure check the output to
sudo fdisk -l or post results.
Then chroot

sudo chroot /mntFollowed by
sudo apt-get update
sudo apt-get install xorgthen unmount and reboot.

sudo umount /dev/sda?

[Verdugo]

Thank you for responding. I had found this solution on another thread right before you had replied and it worked. Thanks again for your help.