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I have Ubuntu 12.04 installed on my dell laptop for couple of months(didn't want it but my company forced it). Rescently I am having some issues in connecting to some wireless networks. So far I have been able to connect to any wireless network. But at present I am not able to connect to my new home wireless , however with same laptop I am able to connect to office wireless and my friends wireless.The wireless is detected by Ubuntu and is present in the list of connection but can't connect, if I click it it is instantly removed not even asking for password. i am able to connect to my home wireless through my iPhone which means that there is no issue with my home wireless connection setup. Even if I use the iPhone as hotspot still not able to connect via Ubuntu

Request some help.

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  • Please edit your question to add details of your wireless card from the terminal: lspci -nn | grep 0280 Thanks. – chili555 May 26 '14 at 17:51
  • Here is the output of the command lspci -nn | grep 0280 03:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] [8086:0082] (rev 34) – Avishek May 27 '14 at 5:57
  • the output of nm-tool --- >> - Device: wlan0 --------------------------------------------------------- Type: 802.11 WiFi Driver: iwlwifi State: disconnected Default: no HW Address: 08:11:96:C0:1C:48 Capabilities: Wireless Properties WEP Encryption: yes WPA Encryption: yes WPA2 Encryption: yes Wireless Access Points (* = current AP) dlink123: Infra, E8:94:F6:3C:43:24, Freq 2437 MHz, Rate 54 Mb/s, Strength 54 WPA2 – Avishek May 27 '14 at 6:07
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You do not have an Atheros wireless card, so the ath9k.conf file is ineffective. Since the problem is only with your new home wireless, I suspect it's a configuration problem in the router.

First, check the settings in the router. WPA2-AES is preferred; not any WPA and WPA2 mixed mode and certainly not TKIP. Second, if your router is capable of N speeds, I have better luck with a channel width of 20 MHz in the 2.4 GHz band instead of automatic 20/40 MHz. I also have better luck with a fixed channel, either 1, 6 or 11, rather than automatic channel selection.

Make sure the router is set to automatic B, G, N and, if it's capable, AC speeds, not locked to N and certainly not locked to AC since the Intel wireless device you have is not AC capable.

After making these changes, reboot the router.

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I experienced this issue once. As far as i know, ubuntu can't connect to WPA 2 PSK wifi security. Try to change your wireless adapter security setting to WPA PSK. I tried this and it works now.

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  • My wireless devices connect to WPA2 perfectly well. – chili555 May 26 '14 at 17:50
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    @AlKaef -- yes the wireless connection I am trying to connect is a WPA2 connection dlink123: Infra, E8:94:F6:3C:43:24, Freq 2437 MHz, Rate 54 Mb/s, Strength 54 WPA2 – Avishek May 27 '14 at 6:09
  • @Avishek have you tried to change it to WPA? – AlKaef May 27 '14 at 11:14
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Is the Wireless turned on? Can you run this script:

echo "options ath9k nohwcrypt=1" | sudo tee -a /etc/modprobe.d/ath9k.conf
sudo modprobe -rfv ath9k
sudo modprobe -v ath9k
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    How on earth would you believe he has an Atheros wireless card?? – chili555 May 26 '14 at 15:53
  • I also used this on a other wireless card. – Korkel May 26 '14 at 16:21
  • echo "options ath9k nohwcrypt=1" | sudo tee -a /etc/modprobe.d/ath9k.conf options ath9k nohwcrypt=1 sudo modprobe -rfv ath9k sudo modprobe -v ath9k insmod /lib/modules/3.2.0-51-generic/kernel/drivers/net/wireless/ath/ath.ko insmod /lib/modules/3.2.0-51-generic/kernel/drivers/net/wireless/ath/ath9k/ath9k_hw.ko insmod /lib/modules/3.2.0-51-generic/kernel/drivers/net/wireless/ath/ath9k/ath9k_common.ko insmod /lib/modules/3.2.0-51-generic/kernel/drivers/net/wireless/ath/ath9k/ath9k.ko nohwcrypt=1 nohwcrypt=1 – Avishek May 27 '14 at 6:26

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