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Thread: Ubuntu can't connect to wifi

  1. #1
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    Ubuntu can't connect to wifi

    I have been using Ubuntu on my laptop for a few years. But honestly I'm still a beginner on the technical side.
    I was running Ubuntu 11.04 and it worked flawlessly. When 11.10 came out, I upgraded it from the update manager, afterwards my laptop isn't able to connect to my home Wifi anymore.
    I tried searching on the forums but didn't find a solution. I tried installing it fresh, with the "erase ubuntu and install...." option and still won't connect, then when 12.04 came out I did a fresh install again. Still no luck.
    Help please? My laptop is Asus K40IN. If I remember correctly it has an Atheros adapter.

  2. #2
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    Re: Ubuntu can't connect to wifi

    Hi there, could you post the output of:
    Code:
    sudo lspci -v
    Edit: Also, is there anything in "Additional Drivers"?

  3. #3
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    Re: Ubuntu can't connect to wifi

    Quote Originally Posted by ubudog View Post
    Hi there, could you post the output of:
    Code:
    sudo lspci -v
    Edit: Also, is there anything in "Additional Drivers"?
    Hi thanks for the very quick response. This is the output

    Code:
    00:00.0 Host bridge: NVIDIA Corporation MCP79 Host Bridge (rev b1)
    	Subsystem: NVIDIA Corporation Device cb79
    	Flags: bus master, 66MHz, fast devsel, latency 0
    
    00:00.1 RAM memory: NVIDIA Corporation MCP79 Memory Controller (rev b1)
    	Subsystem: NVIDIA Corporation Device cb79
    	Flags: bus master, 66MHz, fast devsel, latency 0
    
    00:03.0 ISA bridge: NVIDIA Corporation MCP79 LPC Bridge (rev b3)
    	Subsystem: ASUSTeK Computer Inc. Device 1cf7
    	Flags: bus master, 66MHz, fast devsel, latency 0
    	I/O ports at 4f00 [size=256]
    
    00:03.1 RAM memory: NVIDIA Corporation MCP79 Memory Controller (rev b1)
    	Subsystem: ASUSTeK Computer Inc. Device 1cf7
    	Flags: 66MHz, fast devsel
    
    00:03.2 SMBus: NVIDIA Corporation MCP79 SMBus (rev b1)
    	Subsystem: ASUSTeK Computer Inc. Device 1cf7
    	Flags: 66MHz, fast devsel, IRQ 15
    	I/O ports at 4900 [size=64]
    	I/O ports at 4d00 [size=64]
    	I/O ports at 4e00 [size=64]
    	Capabilities: [44] Power Management version 2
    	Kernel driver in use: nForce2_smbus
    	Kernel modules: i2c-nforce2
    
    00:03.3 RAM memory: NVIDIA Corporation MCP79 Memory Controller (rev b1)
    	Subsystem: NVIDIA Corporation Device cb79
    	Flags: 66MHz, fast devsel
    
    00:03.5 Co-processor: NVIDIA Corporation MCP79 Co-processor (rev b1)
    	Subsystem: ASUSTeK Computer Inc. Device 1cf7
    	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 14
    	Memory at fae80000 (32-bit, non-prefetchable) [size=512K]
    
    00:04.0 USB controller: NVIDIA Corporation MCP79 OHCI USB 1.1 Controller (rev b1) (prog-if 10 [OHCI])
    	Subsystem: ASUSTeK Computer Inc. Device 1cf7
    	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 21
    	Memory at fae7f000 (32-bit, non-prefetchable) [size=4K]
    	Capabilities: [44] Power Management version 2
    	Kernel driver in use: ohci_hcd
    
    00:04.1 USB controller: NVIDIA Corporation MCP79 EHCI USB 2.0 Controller (rev b1) (prog-if 20 [EHCI])
    	Subsystem: ASUSTeK Computer Inc. Device 1cf7
    	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 20
    	Memory at fae7ec00 (32-bit, non-prefetchable) [size=256]
    	Capabilities: [44] Debug port: BAR=1 offset=00a0
    	Capabilities: [80] Power Management version 2
    	Kernel driver in use: ehci_hcd
    
    00:08.0 Audio device: NVIDIA Corporation MCP79 High Definition Audio (rev b1)
    	Subsystem: ASUSTeK Computer Inc. Device 16f3
    	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 23
    	Memory at fae78000 (32-bit, non-prefetchable) [size=16K]
    	Capabilities: [44] Power Management version 2
    	Kernel driver in use: snd_hda_intel
    	Kernel modules: snd-hda-intel
    
    00:09.0 PCI bridge: NVIDIA Corporation MCP79 PCI Bridge (rev b1) (prog-if 01 [Subtractive decode])
    	Flags: bus master, 66MHz, fast devsel, latency 0
    	Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
    	Capabilities: [b8] Subsystem: ASUSTeK Computer Inc. Device 1cf7
    
    00:0b.0 SATA controller: NVIDIA Corporation MCP79 AHCI Controller (rev b1) (prog-if 01 [AHCI 1.0])
    	Subsystem: ASUSTeK Computer Inc. Device 1cf7
    	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 40
    	I/O ports at c080 [size=8]
    	I/O ports at c000 [size=4]
    	I/O ports at bc00 [size=8]
    	I/O ports at b880 [size=4]
    	I/O ports at b800 [size=16]
    	Memory at fae7c000 (32-bit, non-prefetchable) [size=8K]
    	Capabilities: [44] Power Management version 2
    	Capabilities: [8c] SATA HBA v1.0
    	Capabilities: [b0] MSI: Enable+ Count=1/8 Maskable- 64bit+
    	Kernel driver in use: ahci
    
    00:10.0 PCI bridge: NVIDIA Corporation MCP79 PCI Express Bridge (rev b1) (prog-if 00 [Normal decode])
    	Flags: bus master, fast devsel, latency 0
    	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
    	I/O behind bridge: 0000d000-0000dfff
    	Memory behind bridge: faf00000-fbffffff
    	Prefetchable memory behind bridge: 00000000e0000000-00000000f9ffffff
    	Capabilities: [40] Subsystem: ASUSTeK Computer Inc. Device 1cf7
    	Capabilities: [48] Power Management version 2
    	Capabilities: [50] MSI: Enable- Count=1/2 Maskable- 64bit+
    	Kernel modules: shpchp
    
    00:15.0 PCI bridge: NVIDIA Corporation MCP79 PCI Express Bridge (rev b1) (prog-if 00 [Normal decode])
    	Flags: bus master, fast devsel, latency 0
    	Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
    	I/O behind bridge: 0000e000-0000efff
    	Memory behind bridge: fea00000-feafffff
    	Capabilities: [40] Subsystem: ASUSTeK Computer Inc. Device 1cf7
    	Capabilities: [48] Power Management version 3
    	Capabilities: [50] MSI: Enable- Count=1/2 Maskable- 64bit+
    	Capabilities: [80] Express Root Port (Slot+), MSI 00
    	Kernel driver in use: pcieport
    	Kernel modules: shpchp
    
    00:16.0 PCI bridge: NVIDIA Corporation MCP79 PCI Express Bridge (rev b1) (prog-if 00 [Normal decode])
    	Flags: bus master, fast devsel, latency 0
    	Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
    	Memory behind bridge: feb00000-febfffff
    	Capabilities: [40] Subsystem: ASUSTeK Computer Inc. Device 1cf7
    	Capabilities: [48] Power Management version 3
    	Capabilities: [50] MSI: Enable- Count=1/2 Maskable- 64bit+
    	Capabilities: [80] Express Root Port (Slot+), MSI 00
    	Kernel driver in use: pcieport
    	Kernel modules: shpchp
    
    02:00.0 VGA compatible controller: NVIDIA Corporation C79 [GeForce G102M] (rev b1) (prog-if 00 [VGA controller])
    	Subsystem: ASUSTeK Computer Inc. Device 19b4
    	Flags: bus master, fast devsel, latency 0, IRQ 22
    	Memory at fb000000 (32-bit, non-prefetchable) [size=16M]
    	Memory at e0000000 (64-bit, prefetchable) [size=256M]
    	Memory at f8000000 (64-bit, prefetchable) [size=32M]
    	I/O ports at dc00 [size=128]
    	Expansion ROM at fafe0000 [disabled] [size=128K]
    	Capabilities: [60] Power Management version 2
    	Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
    	Kernel driver in use: nouveau
    	Kernel modules: nouveau, nvidiafb
    
    03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)
    	Subsystem: ASUSTeK Computer Inc. U6V/U31J laptop
    	Flags: bus master, fast devsel, latency 0, IRQ 41
    	I/O ports at e800 [size=256]
    	Memory at feaff000 (64-bit, non-prefetchable) [size=4K]
    	Expansion ROM at feac0000 [disabled] [size=128K]
    	Capabilities: [40] Power Management version 2
    	Capabilities: [48] Vital Product Data
    	Capabilities: [50] MSI: Enable+ Count=1/2 Maskable- 64bit+
    	Capabilities: [60] Express Endpoint, MSI 00
    	Capabilities: [84] Vendor Specific Information: Len=4c <?>
    	Capabilities: [100] Advanced Error Reporting
    	Capabilities: [12c] Virtual Channel
    	Capabilities: [148] Device Serial Number 02-00-00-00-68-4c-e0-00
    	Capabilities: [154] Power Budgeting <?>
    	Kernel driver in use: r8169
    	Kernel modules: r8169
    
    04:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01)
    	Subsystem: AzureWave AW-NE771 802.11bgn Wireless Mini PCIe Card [AR9281]
    	Flags: bus master, fast devsel, latency 0, IRQ 18
    	Memory at febf0000 (64-bit, non-prefetchable) [size=64K]
    	Capabilities: [40] Power Management version 2
    	Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit-
    	Capabilities: [60] Express Legacy Endpoint, MSI 00
    	Capabilities: [90] MSI-X: Enable- Count=1 Masked-
    	Capabilities: [100] Advanced Error Reporting
    	Capabilities: [140] Virtual Channel
    	Capabilities: [160] Device Serial Number 00-00-00-00-00-00-00-00
    	Kernel driver in use: ath9k
    	Kernel modules: ath9k
    And the Additional Drivers only shows the NVIDIA drivers

  4. #4
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    Re: Ubuntu can't connect to wifi

    Could you post the output of:
    Code:
    ifconfig

  5. #5
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    Re: Ubuntu can't connect to wifi

    The output of ifconfig :
    Code:
    eth0      Link encap:Ethernet  HWaddr 00:26:18:22:6f:28  
              inet addr:192.168.6.103  Bcast:192.168.6.255  Mask:255.255.255.0
              inet6 addr: fe80::226:18ff:fe22:6f28/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:3260 errors:0 dropped:0 overruns:0 frame:0
              TX packets:1855 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:3265134 (3.2 MB)  TX bytes:200324 (200.3 KB)
              Interrupt:41 Base address:0x2000 
    
    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:16436  Metric:1
              RX packets:427 errors:0 dropped:0 overruns:0 frame:0
              TX packets:427 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:40000 (40.0 KB)  TX bytes:40000 (40.0 KB)
    
    wlan0     Link encap:Ethernet  HWaddr 00:24:23:06:09:1d  
              inet addr:192.168.6.102  Bcast:192.168.6.255  Mask:255.255.255.0
              inet6 addr: fe80::224:23ff:fe06:91d/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:754 errors:0 dropped:0 overruns:0 frame:0
              TX packets:175 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:70527 (70.5 KB)  TX bytes:39731 (39.7 KB)

  6. #6
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    Re: Ubuntu can't connect to wifi

    Ok, I think we're getting somewhere. Assuming you have some form of internet access on the box you're trying to fix, open a terminal and do this:
    Code:
    sudo apt-get update
    Wait for that to finish, then:
    Code:
    sudo apt-get install bcmwl-kernel-source
    Wait for that to finish.

    Then in Additional Drivers, do you see anything new?

  7. #7
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    Re: Ubuntu can't connect to wifi

    If that doesn't work, this might.

  8. #8
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    Re: Ubuntu can't connect to wifi

    Quote Originally Posted by ubudog View Post
    Then in Additional Drivers, do you see anything new?
    Yes it has an ethernet connection right now. Nothing new, sadly
    Still only the nvidia drivers there. I forgot to say that it's the 64bit ubuntu.

  9. #9
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    Re: Ubuntu can't connect to wifi

    Quote Originally Posted by ubudog View Post
    If that doesn't work, this might.
    Okay I am trying this one. Thanks

  10. #10
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    Re: Ubuntu can't connect to wifi

    Quote Originally Posted by iceman1992 View Post
    Okay I am trying this one. Thanks
    Best of luck!

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