Finally, I followed all 3 steps , but still failed. At last, I use Madwifi driver to connect my wifi. Here is my reference site : http://dimitar.me/?p=616. Hope Ubuntu can fix this critical bug soon.
-- [Karmic] Atheros AR5211 - ath5k driver connection and performance issues https://bugs.launchpad.net/bugs/461419 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
