Try downgrade to distribution kernel version or to 2.6.32. And try 
this:http://ubuntuforums.org/showthread.php?t=1309072 or try  this:
comment the ath_pci blacklist in /etc/modprobe.d/blacklist-ath_pci.conf.
check if ath9k (or ath5k) is loaded in /etc/modules
echo ath9k | sudo tee -a /etc/modules
Then  install:
linux-backports-modules-karmic and 
linux-backports-modules-wireless-karmic-generic (and 
linux-backports-modules-wireless-karmic-generic-pae if you can), or just 
install backports.
Reboot .                                                              
 It might help you.You shoud also disable IPv6 support:
gksudo gedit /etc/default/grub
find this line:GRUB_CMDLINE_LINUX 
modify it with:GRUB_CMDLINE_LINUX="ipv6.disable=1"
and update grub:sudo update-grub2
and reboot.

-- 
network-manager ignores static ip configuration setting for wireless
https://bugs.launchpad.net/bugs/504576
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