i have a dell inspiron 1521, before upgrading to 12.04, my laptop ran fine. connected via LAN and wifi. after the upgrade my computer will not connect to the internet in anyway. I know its normal for my wifi to not work after an upgrade or fresh install, however this is the first time that wiring the laptop directly to the router did not work.

Typing ifconfig -a into terminal results in the following
Link encap:Local Loopback
inet addr:  Mask:
inet6 addr:  ::1/128 Scope:Host
RX packets:4436 errors:0 dropped:0 overruns:0 frame:0
TX packets:4436 errors:0 dropped:0 overruns:0 carriers:0
collisions:0 txqueuelen:0
RX bytes:353112 (353.1 KB)  TX bytes:353112 (353.1 KB)
typed that from my laptop so spacing on somethings may be wrong... any help would be fantastic