Wifi and Ethernet connectivity problems after upgrading to Ubuntu 12.04

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http://askubuntu.com – I upgraded recently to ubuntu 12.04 from 11.10, and since then I haven't been able to connect to Internet, neither using wifi, nor using ethernet. I've been reading many posts, but not finding a solution in any. My laptop is a 64-bit HP-G61, my wifi card a Atheros AR9285 and my ethernet card a Realtek RTL 8101E/RTL8102E. Before I upgraded everything worked fine. I have tried to perform a manual network configuration using the terminal, but it didn't work. Has anyone an idea of how can I fix the problem? Is it possible to switch back to the old working 11.10? Thank you very much in advance, I (HowTos)