I'm using an Acer Iconia W500, and immediately after upgrading from 11.10 to 12.04, it is unable to access the internet. It was able to access the internet just fine before the upgrade. It seems to be connecting to the wi-fi network, but I've tried several different websites on several different browsers and none of them can display any pages. I am able to access the internet just fine through the exact same wi-fi connection on my Toshiba Satellite running Linux Mint.
Here are the results from
sudo lspci -v:
01:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01) Subsystem: Foxconn International, Inc. Device e031 Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at 90000000 (64-bit, non-prefetchable) [size=64K] Capabilities:  Power Management version 3 Capabilities:  MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities:  Express Legacy Endpoint, MSI 00 Capabilities:  Advanced Error Reporting Capabilities:  Virtual Channel Capabilities:  Device Serial Number 00-15-17-ff-ff-24-14-12 Capabilities:  Power Budgeting <?> Kernel driver in use: ath9k Kernel modules: ath9k