[SOLVED] ubuntu not loading

[Def_101]

when i start up i get to about quarter way through the splash load bar then the load stops and takes me to a text screen where it shows me some diagnostics the part i believe it is hanging on is it is trying to

reconfigure network interface
ignoring unknown interface eth2=eth2
ignoring unknown interface ath0=ath0

when it gets here i can type but commands don't work

this is the file i tried to edit
gksu gedit /etc/network/interfaces

this is what i added
# The loopback network interface
auto lo
iface lo inet loopback
auto eth2
#iface eth2 inet dhcp
auto ath0
#iface ath0 inet dhcp
# WLAN
allow-hotplug wlan0
auto wlan0
iface wlan0 inet dhcp
wireless-essid [replace this with your network name!]

and i believe this is the original text
auto lo
iface lo inet loopback

[Def_101]

loaded live cd

mounted disk

terminal

sudo gedit /media/disk/etc/network/interfaces (this was the location of the file i changed after mounting

changed my mess up back