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So my problem is that I recently put Ubuntu 12.10 as dual boot on my desktop pc. After a few hours of googling I was able to get my D-Link DWA-142 to "work". However, it will only see the networks but won't connect. It did connect to the network once, but dropped after a few minutes. I already did apt-get upgrade && update. I am currently tethering via my galaxy s2. If I put on a hotspot via the smartphone, it will connect, but will not have an internet conncetion. Thanks in advance.

iwconfig

gives:

wlan0     IEEE 802.11g  ESSID:off/any  
          Mode:Managed  Frequency:2.412 GHz  Access Point: Not-Associated   
          Bit Rate:144.5 Mb/s   Sensitivity=-200 dBm  
          RTS thr=2346 B   Fragment thr=2346 B   
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

nm-tool gives:

NetworkManager Tool

State: connected (global)

- Device: wlan0 ----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            ndiswrapper
  State:             unavailable
  Default:           no
  HW Address:        00:19:5B:55:17:53

  Capabilities:

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points 

While trying to connect

`sudo tail -f /var/log/syslog`

gives me:

Dec 31 18:28:19 ToterLaptop NetworkManager[731]: <info> (wlan0): supplicant interface state: disconnected -> scanning        
Dec 31 18:28:21 ToterLaptop NetworkManager[731]: <warn> Activation (wlan0/wireless): association took too long.        
Dec 31 18:28:21 ToterLaptop NetworkManager[731]: <info> (wlan0): device state change: config -> need-auth (reason 'none') [50 60 0]        
Dec 31 18:28:21 ToterLaptop NetworkManager[731]: <warn> Activation (wlan0/wireless): asking for new secrets    
Dec 31 18:28:21 ToterLaptop NetworkManager[731]: <warn> Couldn't disconnect supplicant interface: This interface is not connected.        
Dec 31 18:28:21 ToterLaptop NetworkManager[731]: <warn> Couldn't disconnect supplicant interface: This interface is not connected.        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: get_secret_flags: assertion `is_secret_prop (setting, secret_name, error)' failed       
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled...        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started...        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> (wlan0): device state change: need-auth -> prepare (reason 'none') [60 40 0]        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled...        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete.        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting...        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0]        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Activation (wlan0/wireless): connection 'Wireless connection 1' has security, and secrets exist.  No new secrets needed.        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Config: added 'ssid' value 'MG'            
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Config: added 'scan_ssid' value    '1'        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Config: added 'key_mgmt' value 'WPA-PSK'        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Config: added 'psk' value '<omitted>'        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete.        
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <warn> Couldn't disconnect supplicant interface: This interface is not connected.       
Dec 31 18:28:24 ToterLaptop NetworkManager[731]: <info> Config: set interface ap_scan to 1        
Dec 31 18:28:29 ToterLaptop kernel: [  621.828627] end_request: I/O error, dev fd0, sector 0        
Dec 31 18:28:29 ToterLaptop kernel: [  621.828634] Buffer I/O error on device fd0, logical block 0        
Dec 31 18:28:34 ToterLaptop wpa_supplicant[2258]: wlan0: Trying to associate with 00:1f:3f:d5:1f:32 (SSID='MG' freq=2412 MHz)        
Dec 31 18:28:37 ToterLaptop NetworkManager[731]: <info> (wlan0): supplicant interface state: scanning -> associating        
Dec 31 18:28:42 ToterLaptop kernel: [  634.000763] end_request: I/O error, dev fd0, sector 0        
Dec 31 18:28:42 ToterLaptop kernel: [  634.000771] Buffer I/O error on device fd0, logical block 0        
Dec 31 18:28:47 ToterLaptop wpa_supplicant[2258]: wlan0: Authentication with 00:1f:3f:d5:1f:32 timed out.        
Dec 31 18:28:47 ToterLaptop NetworkManager[731]: <info> (wlan0): supplicant interface state: associating -> disconnected        
Dec 31 18:28:48 ToterLaptop NetworkManager[731]: <info> (wlan0): supplicant interface state: disconnected -> scanning        
Dec 31 18:28:50 ToterLaptop NetworkManager[731]: <warn> Activation (wlan0/wireless): association took too long.        
Dec 31 18:28:50 ToterLaptop NetworkManager[731]: <info> (wlan0): device state change: config -> need-auth (reason 'none') [50 60 0]        
Dec 31 18:28:50 ToterLaptop NetworkManager[731]: <warn> Activation (wlan0/wireless): asking for new secrets        
Dec 31 18:28:50 ToterLaptop NetworkManager[731]: <warn> Couldn't disconnect supplicant interface: This interface is not connected.        
Dec 31 18:28:50 ToterLaptop NetworkManager[731]: <warn> Couldn't disconnect supplicant interface: This interface is not connected.        
Dec 31 18:28:54 ToterLaptop kernel: [  646.165373] end_request: I/O error, dev fd0, sector 0        
Dec 31 18:28:54 ToterLaptop kernel: [  646.165380] Buffer I/O error on device fd0, logical block 0        
Dec 31 18:28:58 ToterLaptop NetworkManager[731]: <info> (wlan0): supplicant interface state: scanning -> inactive        
Dec 31 18:29:00 ToterLaptop NetworkManager[731]: <warn> No agents were available for this request.        
Dec 31 18:29:00 ToterLaptop NetworkManager[731]: <info> (wlan0): device state change: need-auth -> failed (reason 'no-secrets') [60 120 7]        
Dec 31 18:29:00 ToterLaptop NetworkManager[731]: <info> Marking connection 'Wireless connection 1' invalid.        
Dec 31 18:29:00 ToterLaptop NetworkManager[731]: <warn> Activation (wlan0) failed for connection 'Wireless connection 1'        
Dec 31 18:29:00 ToterLaptop NetworkManager[731]: <info> (wlan0): device state change: failed -> disconnected (reason 'node') [120 30 0]    
Dec 31 18:29:00 ToterLaptop NetworkManager[731]: <info> (wlan0): deactivating device (reason 'none') [0]        
Dec 31 18:29:03 ToterLaptop NetworkManager[731]: <info> (wlan0): device state change: disconnected -> unavailable (reason 'none') [30 20 0]        
Dec 31 18:29:03 ToterLaptop NetworkManager[731]: <info> (wlan0): deactivating device (reason 'none') [0]        
Dec 31 18:29:03 ToterLaptop NetworkManager[731]: <info> (wlan0): taking down device.        
Dec 31 18:29:03 ToterLaptop NetworkManager[731]: <info> WiFi hardware radio set disabled        
Dec 31 18:29:06 ToterLaptop kernel: [  658.337199] end_request: I/O error, dev fd0, sector 0       
Dec 31 18:29:06 ToterLaptop kernel: [  658.337206] Buffer I/O error on device fd0, logical block 0        
Dec 31 18:29:18 ToterLaptop kernel: [  670.508660] end_request: I/O error, dev fd0, sector 0        
Dec 31 18:29:18 ToterLaptop kernel: [  670.508667] Buffer I/O error on device fd0, logical block 0        
Dec 31 18:29:30 ToterLaptop kernel: [  682.677361] end_request: I/O error, dev fd0, sector 0        
Dec 31 18:29:30 ToterLaptop kernel: [  682.677368] Buffer I/O error on device fd0, logical block 0  
Dec 31 18:29:42 ToterLaptop kernel: [  694.845447] end_request: I/O error, dev fd0, sector 0    
Dec 31 18:29:42 ToterLaptop kernel: [  694.845453] Buffer I/O error on device fd0, logical block 0    
Dec 31 18:29:55 ToterLaptop kernel: [  707.021368] end_request: I/O error, dev fd0, sector 0
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2 Answers 2

Try this in your terminal.

1.sudo rfkill list

This will shows you the services on your system.

2.sudo rfkill unblock all

This will unblock all services if anyone is blocked.

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I also noticed this problem, but only on one wifi spot while travelling. It wasn't exactly an Ubuntu/Linux problem, since rebooting to Windows showed almost the exact same behavior.

I was able to get a better connection on an Android, at least it would connect reliably and Wifi would cut out after maybe a few minutes, not a few seconds, as Killer-wireless-card usually did.

My best guess would be one of two things - the wireless driver doesn't have its timeout set correctly (not sure how you would change that except by upgrading to a driver/kernel that fixed that), or there is some type of interference that is affecting your wireless card more than others?

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