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I just installed Ubuntu 14.04 on my Acer Aspire 5740. But it seems that my wireless adapter doesn't work on it. I tried lots of things, but I couldn't make it work.

Here's some information you may want to see:

lspci:

lspci
05:00.0 Network controller: Qualcomm Atheros AR928X Wireless
                               Network Adapter (PCI-Express) (rev 01)

iwconfig:

iwconfig
wlan0     IEEE 802.11bgn  ESSID:"erdi"  
      Mode:Managed  Frequency:2.417 GHz  Access Point: 80:A1:D7:F9:CF:AA   
      Bit Rate=1 Mb/s   Tx-Power=16 dBm   
      Retry  long limit:7   RTS thr:off   Fragment thr:off
      Power Management:off
      Link Quality=70/70  Signal level=-28 dBm  
      Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
      Tx excessive retries:0  Invalid misc:79   Missed beacon:0

lo        no wireless extensions.
eth0      no wireless extensions.

rfkill list all:

rfkill list all

0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
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