Wired Connection Suddenly stopped working on ubuntu 12.04 after update

internet ubuntu-12.04 ethernet wired-networking

19,938

Solution 1

Yours is not a clear-cut situation, so we go by successive approximations.

First, issue these commands:

    sudo service network-manager stop
    sudo ifconfig eth0 down
    sudo ifconfig eth0 up
    sudo dhclient eth0

and see whether this works. In any case, re-issue

    sudo service network-manager start

Second. We may try to install the latest atl1c driver. Go to a convenient, empty directory, and issue these commands:

    sudo apt-get install linux-headers-generic build-essential
    wget http://wireless.kernel.org/download/compat-wireless-2.6/compat-wireless.tar.bz2
    tar xvf compat-wireless.tar.bz2
    cd compat-wireless-2012-12-18/
    scripts/driver-select atl1c
    make
    sudo make install
    sudo rmmod atl1c 
    sudo modprobe atl1c
    sudo ifconfig eth0 down
    sudo ifconfig eth0 up
    sudo dhclient eth0

and see now whether this works. Just let me know, if at all solvable your problem will require a few iterations.

Solution 2

I encountered a problem like this with an old desktop. I spent a couple of days trying to work out what happened. I reloaded the machine several times. Checked all lshw, lspci, ifconfig etc etc. Nothing worked. I even unplugged it and plugged it back in - nothing! The second time I pulled the plug on it - just as I went to plug it back in I noticed that the LED on the PSU did not go fully out.

I then pulled the power cable and left it out until the PSU LED went out - took about 15 seconds.

That resolved the problem.

19,938

tekesteg

Updated on September 18, 2022

Comments

tekesteg almost 2 years
Here is the thing! am on day 5 of no wired internet connection. I have spent the last 4 days searching through every forum and Q&A sites, until i finally decided to post this, so I have done my homework. Before I take my laptop to maintenance shop for hardware failures i want to check with you guys first.

Problem Description: Like the question says my wired connection stopped working suddenly after an update. I am using ubuntu 12.04 LTS. Network Manager says Wired Networks disconnected. Wireless is working perfectly. And also it doesn't work on Windows 7 too, it says cable unplugged. I have tried the cable on other computer and it works perfectly.

nm-tool output:
```
NetworkManager Tool

State: connected (global)

- Device: wlan0  [Connectify-me] -----------------------------------------------
  Type:              802.11 WiFi
  Driver:            iwlwifi
  State:             connected
  Default:           yes
  HW Address:        9C:4E:36:29:F7:D4

  Capabilities:
    Speed:           58 Mb/s

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

  Wireless Access Points (* = current AP)
    TP-LINK_8AB114:  Infra, A0:F3:C1:8A:B1:14, Freq 2452 MHz, Rate 54 Mb/s, Strength 25 WPA2
    ZTE_HG_0:        Infra, 00:1D:0F:BF:BE:61, Freq 2437 MHz, Rate 54 Mb/s, Strength 47
    ZTE_HG_0:        Infra, 00:21:27:C1:19:D9, Freq 2437 MHz, Rate 54 Mb/s, Strength 39
    *Connectify-me:  Infra, E8:39:DF:3E:AF:8E, Freq 2462 MHz, Rate 54 Mb/s, Strength 87 WPA2

  IPv4 Settings:
    Address:         192.168.241.104
    Prefix:          24 (255.255.255.0)
    Gateway:         192.168.241.1

    DNS:             192.168.241.1


- Device: eth0 -----------------------------------------------------------------
  Type:              Wired
  Driver:            atl1c
  State:             unavailable
  Default:           no
  HW Address:        00:1E:DE:F7:A6:C9

  Capabilities:
    Carrier Detect:  yes

  Wired Properties
    Carrier:         off
```
sudo lshw -C network output:
```
  *-network               
       description: Ethernet interface
       product: AR8152 v2.0 Fast Ethernet
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: c1
       serial: 00:1e:de:f7:a6:c9
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.0-NAPI latency=0 link=no multicast=yes port=twisted pair
       resources: irq:48 memory:f7e00000-f7e3ffff ioport:e000(size=128)
  *-network
       description: Wireless interface
       product: Centrino Wireless-N 2200
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlan0
       version: c4
       serial: 9c:4e:36:29:f7:d4
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=3.2.0-57-generic firmware=18.168.6.1 ip=192.168.241.104 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:46 memory:f7d00000-f7d01fff
```
ifconfig eth0 output:
```
eth0      Link encap:Ethernet  HWaddr 00:1e:de:f7:a6:c9  
          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:48 
```
So there you have it guys! Let me know if you need additional information. So Please help me!!!
- Admin over 10 years
  
  It is probably a driver problem. Can you please post the output of lspci -vnn | grep -i net
- Admin over 10 years
  
  01:00.0 Ethernet controller [0200]: Qualcomm Atheros AR8152 v2.0 Fast Ethernet [1969:2062] (rev c1) 02:00.0 Network controller [0280]: Intel Corporation Centrino Wireless-N 2200 [8086:0890] (rev c4)
- Admin over 10 years
  
  @MariusMatutiae..i have also downloaded compat wireless and loaded the module atl1c, but still no luck.
- Admin over 10 years
  
  Try mii-tool -r, pls
- Admin over 10 years
  
  when i tried that without sudo i get SIOCGMIIPHY on 'eth0' failed: Operation not permitted SIOCGMIIPHY on 'eth1' failed: Operation not permitted SIOCGMIIPHY on 'eth2' failed: Operation not permitted SIOCGMIIPHY on 'eth3' failed: Operation not permitted SIOCGMIIPHY on 'eth4' failed: Operation not permitted SIOCGMIIPHY on 'eth5' failed: Operation not permitted SIOCGMIIPHY on 'eth6' failed: Operation not permitted SIOCGMIIPHY on 'eth7' failed: Operation not permitted no MII interfaces found When i use sudo i get restarting autonegotiation...
- Admin over 10 years
  
  And does it work? I take it it does not... (sudo is required)
- Admin over 10 years
  
  Unfortunately it doesn't work.
- Admin over 10 years
  
  @MariusMatutiae...don't give up on me man.
- Admin over 10 years
  
  Ok, but after lunch and class, sorry
- Admin over 10 years
  
  Please post output of sudo ethtool eth0; if you don0t have ethtool, sudo apt-get install ethtool.
- Admin over 10 years
  
  Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: Not reported Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: Unknown! Duplex: Unknown! (255) Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on MDI-X: Unknown Supports Wake-on: pg Wake-on: d Current message level: 0x0000003f (63) drv probe link timer ifdown ifup Link detected: no
- Admin over 10 years
  
  The last line here says: Link detected:no. So either it is not a software problem, or if it is, it is at the kernel level, which is way outside my horizon. You may try checking the cable, but apart from this I am at my wit's end. Sorry.
- Admin over 10 years
  
  @MariusMatutiae...Thank you for trying...I guess am gonna have to take it to the maintenance shop.
tekesteg over 10 years

All of the above didn't solve the problem. sudo ifconfig eth0 up and sudo ifconfig eth0 down didn't give any response` but sudo dhclient eth0 stays on the prompt without any response, it doesn't close. The output of sudo make install this might be helpful make[1]: Entering directory `/usr/src/linux-headers-3.8.0-34-generic' INSTALL /home/take/trouble/compat-wireless-2012-12-18/compat/compat.‌ko Can't read private key INSTALL /home/take/trouble/compat-wireless-2012-12-18/drivers/net/et‌hernet/atheros/atl1c‌/atl1c.ko Can't read private key DEPMOD 3.8.0-34-generic
MariusMatutiae over 10 years

Can't read private key does not mean anything, just plunge ahead. But did you stop network manager before trying the first method? It is important.
tekesteg over 10 years

yes i did. It stopped my wifi connection too. I re enabled it to post here.
VL-80 over 10 years

Could you explain your answer little bit more?