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Thread: Cannot connect to WiFi

  1. #1
    Join Date
    Oct 2011
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    6

    Cannot connect to WiFi

    I'm fairly new to ubuntu and I just installed ubuntu 11 on a laptop. I had an old version of ubuntu 8 running on the same laptop, but decided to reinstall/upgrade to ubuntu 11. I have not been able to connect to wifi since I upgraded.

    I have a Linksys wireless G Network adapter (model WPC 54G ver.2) and have a Linksys WRT54G2 v1 router. I have tried the following configurations:
    -clicked on pie shaped icon (at top right) and then 'edit connections'
    -wireless tab
    -highlighted the only wireless network I currently have in there
    -made sure SSID is correct
    -left the following blank: BSSID, Device mac address, cloned mac address
    -on the wireless security tab:
    -security is set to wep 128-bit PassPhrase
    -key: correct password for wifi
    -wep index: 1(default)
    -authentication: open system
    -regarding the ipv4 and ipv6 setting, I did not change anything.

    My last question is a general question in regard to detection of wifi networks. Like many, I come from a Windows background and am used to a window called 'connect to a network' where I can see a listing of all available WiFi in my current location along with signal strength. Does ubuntu have something similar?

  2. #2
    Join Date
    Nov 2007
    Location
    Les Gets, France
    Beans
    753
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Cannot connect to WiFi

    Hi

    Normally, when you click the "pie" icon at top right, the dropdown includes the SSIDs of the available networks. If none are visible, perhaps the wireless is turned off with a hardware switch? Can you use another device to check that the network is actually available?

    In your "edit connections", check that under IPV4, "connect automatically" and "automatic DHCP" are selected. Set IPV6 to "ignore" for now.
    Last edited by roger_1960; October 8th, 2011 at 03:33 PM. Reason: correction

  3. #3
    Join Date
    Oct 2011
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    Re: Cannot connect to WiFi

    Quote Originally Posted by roger_1960 View Post
    Normally, when you click the "pie" icon at top right, the dropdown includes the SSIDs of the available networks.
    I installed umbuntu 11 (not sure if this is different). When I click the pie-shaped icon, I get a dropdown consisting of:
    • Wired network (dulled out, not clickable)
    • Disconnected (dulled out, not clickable)
    • VPN connections
    • (check mark) Enable networking
    • connection information (dulled out, not clickable)
    • edit connections...


    Quote Originally Posted by roger_1960 View Post
    In your "edit connections", check that under IPV4, "connect automatically" and "automatic DHCP" are selected.
    They are.

    Quote Originally Posted by roger_1960 View Post
    Set IPV6 to "ignore" for now.
    It is.

    Quote Originally Posted by roger_1960 View Post
    Can you use another device to check that the network is actually available?
    Yes. The wifi is up. (hence these posts)
    Last edited by Roger Dodger; October 8th, 2011 at 05:14 PM.

  4. #4
    Join Date
    Aug 2011
    Location
    Berlin, Germany
    Beans
    7,094
    Distro
    Ubuntu Gnome 14.04 Trusty Tahr

    Re: Cannot connect to WiFi

    Hi,

    please show:

    Code:
    lsusb
    lsmod
    iwconfig
    rfkill list
    sudo iwlist scan

  5. #5
    Join Date
    Oct 2011
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    Re: Cannot connect to WiFi

    Quote Originally Posted by praseodym View Post
    please show:

    Code:
    lsusb
    lsmod
    iwconfig
    rfkill list
    sudo iwlist scan
    Thanks for the reply. I should note that I have been able to connect through a ethernet cable since I last posted. I'm not sure if it is pertinent to these tests, but these tests were run with the ethernet connection enabled.

    Code:
    john@john-Inspiron-1000:/tmp$ lsusb
    Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    john@john-Inspiron-1000:/tmp$ lsmod
    Module                  Size  Used by
    binfmt_misc            13213  1 
    parport_pc             32111  0 
    ppdev                  12849  0 
    vesafb                 13449  1 
    snd_intel8x0           33213  2 
    snd_ac97_codec        105614  1 snd_intel8x0
    ac97_bus               12642  1 snd_ac97_codec
    snd_pcm                80244  2 snd_intel8x0,snd_ac97_codec
    snd_seq_midi           13132  0 
    snd_rawmidi            25269  1 snd_seq_midi
    snd_seq_midi_event     14475  1 snd_seq_midi
    snd_seq                51291  2 snd_seq_midi,snd_seq_midi_event
    pcmcia                 39671  0 
    joydev                 17322  0 
    snd_timer              28659  2 snd_pcm,snd_seq
    snd_seq_device         14110  3 snd_seq_midi,snd_rawmidi,snd_seq
    snd                    55295  11 snd_intel8x0,snd_ac97_codec,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
    yenta_socket           27230  0 
    soundcore              12600  1 snd
    snd_page_alloc         14073  2 snd_intel8x0,snd_pcm
    pcmcia_rsrc            18292  1 yenta_socket
    psmouse                73312  0 
    serio_raw              12990  0 
    i2c_sis96x             12743  0 
    dcdbas                 14054  0 
    sis_agp                13127  1 
    pcmcia_core            21505  3 pcmcia,yenta_socket,pcmcia_rsrc
    shpchp                 32345  0 
    lp                     13349  0 
    parport                36746  3 parport_pc,ppdev,lp
    sis900                 22568  0 
    john@john-Inspiron-1000:/tmp$ iwconfig
    lo        no wireless extensions.
    
    eth0      no wireless extensions.
    
    john@john-Inspiron-1000:/tmp$ rfkill list
    john@john-Inspiron-1000:/tmp$ sudo iwlist scan
    lo        Interface doesn't support scanning.
    
    eth0      Interface doesn't support scanning.
    
    john@john-Inspiron-1000:/tmp$
    Last edited by Roger Dodger; October 8th, 2011 at 06:21 PM.

  6. #6
    Join Date
    Nov 2007
    Location
    Les Gets, France
    Beans
    753
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Cannot connect to WiFi

    Mmm

    That suggests that your laptop is not detecting the wlan card at all. It is probably a driver issue.

    If you run
    lspci
    in terminal, and
    iwconfig
    in terminal, and
    rfkill list all
    could you post the output.

  7. #7
    Join Date
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    Location
    Berlin, Germany
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    Ubuntu Gnome 14.04 Trusty Tahr

    Re: Cannot connect to WiFi

    Well, seems like a PCI card?! Show

    Code:
    lspci -nnk | grep -iA2 net
    No wireless module is shown...

  8. #8
    Join Date
    Nov 2007
    Location
    Les Gets, France
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    753
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Cannot connect to WiFi

    Over to praseodym so we don't cross posts. One thought - have you pulled out and re seated the PCI card a few times to ensure the connections are OK?

  9. #9
    Join Date
    Oct 2011
    Beans
    6

    Re: Cannot connect to WiFi

    Roger, yes I pulled the card in and out a few times. Here is the output from the terminal:

    Code:
    john@john-Inspiron-1000:/tmp$ lspci
    00:00.0 Host bridge: Silicon Integrated Systems [SiS] 650/M650 Host (rev 80)
    00:01.0 PCI bridge: Silicon Integrated Systems [SiS] Virtual PCI-to-PCI bridge (AGP)
    00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS962 [MuTIOL Media IO] (rev 25)
    00:02.1 SMBus: Silicon Integrated Systems [SiS] SiS961/2 SMBus Controller
    00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE]
    00:02.6 Modem: Silicon Integrated Systems [SiS] AC'97 Modem Controller (rev a0)
    00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] AC'97 Sound Controller (rev a0)
    00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
    00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
    00:03.2 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller
    00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] SiS900 PCI Fast Ethernet (rev 91)
    00:0a.0 CardBus bridge: Texas Instruments PCI1510 PC card Cardbus Controller
    01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 65x/M650/740 PCI/AGP VGA Display Adapter
    02:00.0 Network controller: Texas Instruments ACX 111 54Mbps Wireless Interface
    
    john@john-Inspiron-1000:/tmp$ iwconfig
    lo        no wireless extensions.
    
    eth0      no wireless extensions.
    
    john@john-Inspiron-1000:/tmp$ rfkill list all
    john@john-Inspiron-1000:/tmp$

  10. #10
    Join Date
    Oct 2011
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    Re: Cannot connect to WiFi

    praseodym,
    Code:
    john@john-Inspiron-1000:/tmp$ lspci -nnk | grep -iA2 net
    00:04.0 Ethernet controller [0200]: Silicon Integrated Systems [SiS] SiS900 PCI Fast Ethernet [1039:0900] (rev 91)
        Subsystem: Dell Device [1028:0195]
        Kernel driver in use: sis900
    --
    02:00.0 Network controller [0280]: Texas Instruments ACX 111 54Mbps Wireless Interface [104c:9066]
        Subsystem: Linksys WPC54G v2 802.11g Wireless-G Notebook Adapter [1737:0033]
    john@john-Inspiron-1000:/tmp$

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