All is said in the title. I'm on Ubuntu 12.10. I went on holidays for one month, where I upgraded from 12.04 to 12.10. I just came home today, I turned my computer on, the wifi connected (same password, same settings as before, everything), but the internet doesn't work whatsoever (can't go to any website via Firefox, can't ping google, etc.)
I seem to be able to ping my own IP adress though, if that helps.
Thanks a lot.