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I just built a computer from scratch and installed Ubuntu 13.10 on it (dual booted with Win8). It has a TP-LINK TL-WDN4800 Dual Band Wireless PCIe wireless card, which connects fine to my home network in Windows. However, in Ubuntu it can see all the wireless networks but when I try to connect (using the network-manager GUI), it fails to connect. I tailed the logs and get this:

==> /var/log/kern.log <==
Jan  5 01:50:02 sam-ubuntu kernel: [ 1424.954780] wlan1: authenticate with 28:c6:8e:90:58:b5
Jan  5 01:50:02 sam-ubuntu kernel: [ 1424.964135] wlan1: direct probe to 28:c6:8e:90:58:b5 (try 1/3)
Jan  5 01:50:02 sam-ubuntu kernel: [ 1425.165893] wlan1: direct probe to 28:c6:8e:90:58:b5 (try 2/3)
Jan  5 01:50:02 sam-ubuntu kernel: [ 1425.370177] wlan1: direct probe to 28:c6:8e:90:58:b5 (try 3/3)
Jan  5 01:50:03 sam-ubuntu kernel: [ 1425.574425] wlan1: authentication with 28:c6:8e:90:58:b5 timed out
Jan  5 01:50:11 sam-ubuntu kernel: [ 1434.044035] wlan1: authenticate with 28:c6:8e:90:58:b5
Jan  5 01:50:11 sam-ubuntu kernel: [ 1434.053699] wlan1: direct probe to 28:c6:8e:90:58:b5 (try 1/3)
Jan  5 01:50:11 sam-ubuntu kernel: [ 1434.255130] wlan1: direct probe to 28:c6:8e:90:58:b5 (try 2/3)
Jan  5 01:50:11 sam-ubuntu kernel: [ 1434.459440] wlan1: direct probe to 28:c6:8e:90:58:b5 (try 3/3)
Jan  5 01:50:12 sam-ubuntu kernel: [ 1434.663724] wlan1: authentication with 28:c6:8e:90:58:b5 timed out
Jan  5 01:50:13 sam-ubuntu kernel: [ 1436.447284] wlan1: authenticate with 28:c6:8e:90:58:b5
Jan  5 01:50:13 sam-ubuntu kernel: [ 1436.459921] wlan1: direct probe to 28:c6:8e:90:58:b5 (try 1/3)
Jan  5 01:50:14 sam-ubuntu kernel: [ 1436.662602] wlan1: direct probe to 28:c6:8e:90:58:b5 (try 2/3)
Jan  5 01:50:14 sam-ubuntu kernel: [ 1436.866890] wlan1: direct probe to 28:c6:8e:90:58:b5 (try 3/3)
Jan  5 01:50:14 sam-ubuntu kernel: [ 1437.071173] wlan1: authentication with 28:c6:8e:90:58:b5 timed out

The strange thing is that the same thing happens even when I try to connect to a wired network, and also when I try to connect to an unsecured wifi network. The same issue was present when I tried from a Ubuntu 12.04 Live CD. I don't think it's a wireless card issue since it also affects wired networks. Any ideas? I've pasted some info below, please let me know if there is anything else I should provide. Many thanks!

lspci

00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890 PCI to PCI bridge (external gfx0 port B) (rev 02)
00:02.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890 PCI to PCI bridge (PCI express gpp port B)
00:09.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890 PCI to PCI bridge (PCI express gpp port H)
00:0a.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890 PCI to PCI bridge (external gfx1 port A)
00:0b.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890 PCI to PCI bridge (NB-SB link)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode] (rev 40)
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:12.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:13.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 SMBus Controller (rev 42)
00:14.1 IDE interface: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 IDE Controller (rev 40)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 Azalia (Intel HDA) (rev 40)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 LPC host controller (rev 40)
00:14.4 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 PCI to PCI Bridge (rev 40)
00:14.5 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI2 Controller
00:15.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB700/SB800/SB900 PCI to PCI bridge (PCIE port 0)
00:15.1 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB700/SB800/SB900 PCI to PCI bridge (PCIE port 1)
00:15.2 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB900 PCI to PCI bridge (PCIE port 2)
00:16.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:16.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 5
01:00.0 VGA compatible controller: NVIDIA Corporation GK106 [GeForce GTX 660] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GK106 HDMI Audio Controller (rev a1)
02:00.0 USB controller: Etron Technology, Inc. EJ168 USB 3.0 Host Controller (rev 01)
03:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9172 SATA 6Gb/s Controller (rev 11)
04:00.0 Network controller: Qualcomm Atheros AR93xx Wireless Network Adapter (rev 01)
05:0e.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306/7/8 [Fire II(M)] IEEE 1394 OHCI Controller (rev c0)
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
07:00.0 USB controller: Etron Technology, Inc. EJ168 USB 3.0 Host Controller (rev 01)
08:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9172 SATA 6Gb/s Controller (rev 11)

ifconfig

eth0      Link encap:Ethernet  HWaddr 94:de:80:a6:df:3d  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:112 errors:0 dropped:0 overruns:0 frame:0
          TX packets:112 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:8768 (8.7 KB)  TX bytes:8768 (8.7 KB)

wlan1     Link encap:Ethernet  HWaddr c0:4a:00:14:5d:c5  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

iwconfig

wlan1     IEEE 802.11abgn  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=30 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off

eth0      no wireless extensions.

lo        no wireless extensions.

sudo lshw -C network

[sudo] password for sam: 
  *-network               
       description: Wireless interface
       product: AR93xx Wireless Network Adapter
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: wlan1
       version: 01
       serial: c0:4a:00:14:5d:c5
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
       configuration: broadcast=yes driver=ath9k driverversion=3.11.0-12-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11abgn
       resources: irq:32 memory:fe500000-fe51ffff memory:fe520000-fe52ffff
  *-network
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:06:00.0
       logical name: eth0
       version: 06
       serial: 94:de:80:a6:df:3d
       size: 10Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168e-3_0.0.4 03/27/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:76 ioport:b000(size=256) memory:fe300000-fe300fff memory:da100000-da103fff
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