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Thread: 12.04 upgrade, now cannot connect to Internet

  1. #1
    Join Date
    Oct 2008
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    Lubuntu 12.04 Precise Pangolin

    [SOLVED] 12.04 upgrade, now cannot connect to Internet

    I do not know with certainty that my problem is related to the upgrade; the only other possibility is that my mobo's Realtek ethernet hardware has gone bad.

    The ethernet connection worked fine for a few days after the upgrade from 11.10, but I've read elsewhere of other users experiencing wonky wireless problems that took time to kick in after an upgrade, and there were no changes to the hardware coincident with the loss of ethernet communication.

    I have already manually installed the current driver from Realtek and ensured that it is not competing with an incorrect Realtek driver (apparently this is a common explanation for the problem I've encountered).

    'lspci -nn', among other things, returned:
    Code:
    05:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 03)
    'sudo nm-tool' resulted in:
    Code:
    sudo: nm-tool: command not found
    'lsmod | grep r8' returned:
    Code:
    r8168        215626   0
    Is Network Manager borked? If so, how do I fix it without an Internet connection?

    If there is a thread out there I should be reading instead of pestering you fine people, I'd be grateful for a reference. What I've been able to find thus far has not helped, though it did provide me with the commands I used above. Sorry if my typing is a bit off; I'm borrowing my wife's computer and she hates it when I switch her keyboard from QWERTY to Dvorak, so it's all hunt and peck for me.....

    FWIW, I'm running 64-bit Precise Pangolin on my computer. I tried using 12.04 install USB to restore ethernet function by simply reinstalling everything, but it could not establish Internet connectivity during install, so I aborted the install.

    Help? Thanks!
    Last edited by Cincinnatux; May 9th, 2012 at 03:46 AM. Reason: Problem resolved.

  2. #2
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    Re: 12.04 upgrade, now cannot connect to Internet

    Please show
    cat /etc/network/interfaces
    cat /etc/resolv.conf
    ifconfig -a

  3. #3
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    Re: 12.04 upgrade, now cannot connect to Internet

    Quote Originally Posted by praseodym View Post
    Please show
    Thanks for the quick reply!
    /etc/network/interfaces shows only the following two lines uncommented:

    Code:
    auto lo
    iface lo inet loopback
    There are no uncommented lines in /etc/resolv.conf; the commented lines are as follows:
    Code:
    Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
    DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
    ifconfig -a returns:
    Code:
    eth0     Link encap:Ethernet  HWaddr 00:24:1d:7e:4f:63
             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)
             Interrupt:45 Base address:0x2000
    The file repeats this information for eth1, changing only the HWadd from :63 to :72, the Interrupt from 45 to 46, and the Base address from 0x2000 to 0x4000. The lo information in resolv.conf looks as follows:

    Code:
    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:18764 errors:0 dropped:0 overruns:0 frame:0
             TX packets:18764 errors:0 dropped:0 overruns:0 carrier:0
             collisions:0 txqueuelen:0
             RX bytes:1523568 (1.5 MB)  TX bytes:1523568 (1.5 MB)
    Should I be able to understand these files? I feel a bit simpleminded; I've been running Ubuntu as my primary OS (I no longer even dual-boot) since Feisty Fawn (after spending 15 years of frustration with DOS and Windows) and I still look at this stuff and scratch my head.... Anyway, thanks for taking the time; I hope this thread proves useful to others.

  4. #4
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    Re: 12.04 upgrade, now cannot connect to Internet

    As an update, I have confirmed a hardware failure: the Westell A90 wireless modem (supplied by my ISP) still supports WiFi, but all of its Ethernet ports are non-functioning. My wife's computer (a Win7 machine) and my XBOX can both connect to the Internet wirelessly through the A90, but relying on direct Ethernet cable connections results in failure for both machines. I am hoping to get the modem replaced today, and will report back on whether that fixes anything.

  5. #5
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    Re: 12.04 upgrade, now cannot connect to Internet

    Try internet connection sharing via the Win-machine. I dont know if you need a cross-cable for it?!

  6. #6
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    Re: 12.04 upgrade, now cannot connect to Internet

    Quote Originally Posted by Cincinnatux View Post
    As an update, I have confirmed a hardware failure: the Westell A90 wireless modem (supplied by my ISP) still supports WiFi, but all of its Ethernet ports are non-functioning. My wife's computer (a Win7 machine) and my XBOX can both connect to the Internet wirelessly through the A90, but relying on direct Ethernet cable connections results in failure for both machines. I am hoping to get the modem replaced today, and will report back on whether that fixes anything.
    Well, I can confirm that replacing the modem does nothing to restore Ethernet capability to my Ubuntu box. The XBOX is able to use the Ethernet again, though. I guess that's something.

  7. #7
    Join Date
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    Re: 12.04 upgrade, now cannot connect to Internet

    Quote Originally Posted by praseodym View Post
    Try internet connection sharing via the Win-machine. I dont know if you need a cross-cable for it?!
    Assuming I could do this, what then? This would be, at best, a temporary solution, as the two computers are not normally near each other.

  8. #8
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    Re: 12.04 upgrade, now cannot connect to Internet

    I was able to get the Ethernet during recovery mode, but lacked the know-how to use that to restore Ethernet function in my desktop. So I'm now in the process of reinstalling 12.04 from scratch. Surely, if I'm looking at a software problem, this will either fix it or simplify my troubleshooting a bit (since I had originally used the 'upgrade' function to go from Oneiric to Precise, and I know that there is a greater risk of things going funky during such upgrades and it is possible that a clean install will do the trick here).

    I wish I could take a more sophisticated approach to my problem, but I have not learned enough Linux troubleshooting to do that. I will post an update after I have time to finish the install and check everything.

  9. #9
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    Re: 12.04 upgrade, now cannot connect to Internet

    I had this problem with Ubuntu 12:04 so, I moved to Linux Mint - same thing, then onto Xubuntu 12:04 again same thing. Live cd works in each case. In all cases problem started after first update.

    By the way I have a "wired" connection
    Last edited by Chilongola; May 8th, 2012 at 11:17 PM.
    FREEDOM COMES WHEN LEFT ALONE!!

  10. #10
    Join Date
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    Re: 12.04 upgrade, now cannot connect to Internet

    Quote Originally Posted by Chilongola View Post
    I had this problem with Ubuntu 12:04 so, I moved to Linux Mint - same thing, then onto Xubuntu 12:04 again same thing. Live cd works in each case. In all cases problem started after first update.

    By the way I have a "wired" connection
    I wish I had useful advice for you. I got around the problem by reinstalling 12.04. So far, so good. Still no clue what hacked it all up in the first place.

    For the record, with my fresh install, I now get:

    Code:
    ~$ lspci -nn | grep Ethernet
    05:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 03)
    06:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 03)
    Code:
    ~$ sudo nm-tool
    [sudo] password for m:
    
    NetworkManager Tool
    
    State: connected (global)
    
    - Device: eth1  [Wired connection 2] -------------------------------------------
      Type:              Wired
      Driver:            r8169
      State:             connected
      Default:           yes
      HW Address:        00:24:1D:7E:4F:72
    
      Capabilities:
        Carrier Detect:  yes
        Speed:           100 Mb/s
    
      Wired Properties
        Carrier:         on
    
      IPv4 Settings:
        Address:         192.168.200.30
        Prefix:          24 (255.255.255.0)
        Gateway:         192.168.200.1
    
        DNS:             192.168.200.1
    
    
    - Device: eth0 -----------------------------------------------------------------
      Type:              Wired
      Driver:            r8169
      State:             unavailable
      Default:           no
      HW Address:        00:24:1D:7E:4F:63
    
      Capabilities:
        Carrier Detect:  yes
    
      Wired Properties
        Carrier:         off
    Code:
    :~$ lsmod | grep r8
    r8169                  62099  0
    As I understand it, this means that I'm not actually using the correct driver for my Ethernet card, but it works for now. Should I have problems, I will likely start by uninstalling the r8169 driver and install the r8168 driver to match my r8168 hardware.
    Code:
    ~$ cat /etc/network/interfaces
    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5).
    
    # The loopback network interface
    auto lo
    iface lo inet loopback
    
    # The primary network interface
    auto eth1
    #NetworkManager#iface eth1 inet dhcp
    Code:
    ~$ ifconfig -a 
    eth0      Link encap:Ethernet  HWaddr 00:24:1d:7e:4f:63  
              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)
              Interrupt:45 Base address:0x2000 
    
    eth1      Link encap:Ethernet  HWaddr 00:24:1d:7e:4f:72  
              inet addr:192.168.200.30  Bcast:192.168.200.255  Mask:255.255.255.0
              inet6 addr: fe80::224:1dff:fe7e:4f72/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:4613 errors:0 dropped:0 overruns:0 frame:0
              TX packets:2082 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:3398810 (3.3 MB)  TX bytes:280021 (280.0 KB)
              Interrupt:46 Base address:0x4000 
    
    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:128 errors:0 dropped:0 overruns:0 frame:0
              TX packets:128 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:12874 (12.8 KB)  TX bytes:12874 (12.8 KB)
    Now I'm off to restore my preferred settings. Here's hoping I don't screw anything up....

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