我有 Ubuntu 12.04.1 和以下 wifi 设备：
02:00.0 Ethernet controller: Atheros Communications Inc. AR242x / AR542x Wireless Network Adapter (PCI-Express) (rev 01)
我已经加载了以下驱动程序：
Module Size Used by
usbhid 41906 0
hid 77367 1 usbhid
parport_pc 32114 0
rfcomm 38139 0
ppdev 12849 0
bnep 17830 2
bluetooth 158438 10 rfcomm,bnep
joydev 17393 0
arc4 12473 2
snd_hda_codec_si3054 12864 1
snd_hda_codec_realtek 174313 1
pcmcia 39791 0
uvcvideo 67203 0
psmouse 86421 0
snd_hda_intel 32765 3
snd_hda_codec 109562 3 snd_hda_codec_si3054,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep 13276 1 snd_hda_codec
snd_pcm 80845 3 snd_hda_codec_si3054,snd_hda_intel,snd_hda_codec
snd_seq_midi 13132 0
videodev 86588 1 uvcvideo
ath5k 145127 0
snd_rawmidi 25424 1 snd_seq_midi
tifm_7xx1 12937 0
ath 19387 1 ath5k
mac80211 436455 1 ath5k
tifm_core 15040 1 tifm_7xx1
serio_raw 13027 0
snd_seq_midi_event 14475 1 snd_seq_midi
yenta_socket 27465 0
pcmcia_rsrc 18367 1 yenta_socket
pcmcia_core 21511 3 pcmcia,yenta_socket,pcmcia_rsrc
snd_seq 51567 2 snd_seq_midi,snd_seq_midi_event
snd_timer 28931 2 snd_pcm,snd_seq
snd_seq_device 14172 3 snd_seq_midi,snd_rawmidi,snd_seq
snd 62064 16 snd_hda_codec_si3054,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
i915 419070 3
mac_hid 13077 0
drm_kms_helper 45466 1 i915
cfg80211 178679 3 ath5k,ath,mac80211
drm 197692 4 i915,drm_kms_helper
i2c_algo_bit 13199 1 i915
soundcore 14635 1 snd
snd_page_alloc 14108 2 snd_hda_intel,snd_pcm
video 19068 1 i915
lp 17455 0
parport 40930 3 parport_pc,ppdev,lp
firewire_ohci 40172 0
sdhci_pci 18324 0
sdhci 28241 1 sdhci_pci
firewire_core 56906 1 firewire_ohci
crc_itu_t 12627 1 firewire_core
sky2 53628 0
我使用 NetworkManager 连接网络，但就是没成功...它尝试并请求密码，但没有连接。之前我安装了 madwifi 驱动程序，我认为它可能会覆盖一些库。
我如何重新安装原始驱动程序或在哪里可以找到适合我的卡的更好的驱动程序？