I have just installed Ubuntu 13.04, and am using an Atheros wireless card (AR5BWB222). I find that I can see networks, but cannot connect to any of them. Attempting to do so leads to about 30 seconds of attempting to connect, following by a message telling me that I have been disconnected. I have no backup network connection and cannot therefore run any sudo apt-get commands, although I can transfer files very slowly by loading Windows 8 and saving files to another partition (I cannot use a USB stick as only my two USB 3.0 ports appear to be recognized by Ubuntu, both of which I need for mouse/keyboard). lsmod tells me that ath9k is in use, but fixes related to using usehwcrypt=0 have had no effect. rfkill shows no hard or soft block. I will happily post any and all relevant diagnostic information, of course.

I apologize if I am repeating an already known bug, but my searches elsewhere have not given me any working solutions. This is particularly problematic as I need to install the wireless to be able to run boot-repair before I can even boot into the right partition to begin fixing my problems with the USB...