Ubuntu 14.04 Ethernet stopped working suddenly.

Is it disabled in BIOS?

Please sir let me know how to check whether it is disabled in BIOS or not. I am somewhat beginner to bash language.Sent from RediffmailNG on Android

From: &quot;actionparsnip&quot;<email address hidden>
Sent:Fri, 03 Jun 2016 17:52:20 +0530
To: <email address hidden>
Subject: Re: [Question #294808]: Ubuntu 14.04 Ethernet stopped working suddenly.
Your question #294808 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/294808
>
> Status: Open =&gt; Needs information
>
> actionparsnip requested more information:
> Is it disabled in BIOS?
>
> --
> To answer this request for more information, you can either reply to
> this email or enter your reply at the following page:
> https://answers.launchpad.net/ubuntu/+question/294808
>
> You received this question notification because you asked the question.
>

Its nothing to do with BASH or any coding, or any OS. Its the thing that the system loads when it first boots.

I checked BIOS setup. It is not disabled in it.Sent from RediffmailNG on Android

From: &quot;actionparsnip&quot;<email address hidden>
Sent:Fri, 03 Jun 2016 17:52:20 +0530
To: <email address hidden>
Subject: Re: [Question #294808]: Ubuntu 14.04 Ethernet stopped working suddenly.
Your question #294808 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/294808
>
> Status: Open =&gt; Needs information
>
> actionparsnip requested more information:
> Is it disabled in BIOS?
>
> --
> To answer this request for more information, you can either reply to
> this email or enter your reply at the following page:
> https://answers.launchpad.net/ubuntu/+question/294808
>
> You received this question notification because you asked the question.
>

I checked BIOS setup. It is not disabled in it.

Does the Ethernet port on your computer have LED indicators?
Are they lighting up / blinking as before when the network was working?

What is the output of the commands (to be executed ion a terminal window):

uname -a
lsb_release -crid
ifconfig -a
sudo lshw -C network

Respected Sir

Ethernet port on my laptop have Green and Yellow LED Indicator. However only green LED indicator continuously run. Yellow indicator runs only at the time of ethernet cable attempts to connect the internet. However no connection is established. Thereafter it remains turn off.

I am giving the outputs of the command suggested by you. Those are

Output of command uname -a is

Linux ubuntu-HP-ProBook-440-G1 3.13.0-44-generic #73-Ubuntu SMP Tue Dec 16 00:22:43 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Output of Command lsb_release -crid is

Distributor ID: Ubuntu
Description: Ubuntu 14.04.4 LTS
Release: 14.04
Codename: trusty

Output of Command ifconfig -a is

eth0 Link encap:Ethernet HWaddr 14:58:d0:17:7d:07
          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)

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:65536 Metric:1
          RX packets:2628 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2628 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:245864 (245.8 KB) TX bytes:245864 (245.8 KB)

wlan0 Link encap:Ethernet HWaddr 18:cf:5e:6c:b7:50
          inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
          inet6 addr: fe80::1acf:5eff:fe6c:b750/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:187076 errors:0 dropped:0 overruns:0 frame:0
          TX packets:146793 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:236175996 (236.1 MB) TX bytes:15105756 (15.1 MB)

Output of command sudo lshw -C network is

[sudo] password for ubuntu:
  *-network
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eth0
       version: 0c
       serial: 14:58:d0:17:7d:07
       size: 10Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168g-2_0.0.1 02/06/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:47 ioport:3000(size=256) memory:d0700000-d0700fff memory:d0400000-d0403fff
  *-network
       description: Wireless interface
       product: QCA9565 / AR9565 Wireless Network Adapter
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 01
       serial: 18:cf:5e:6c:b7:50
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
       configuration: broadcast=yes driver=ath9k driverversion=3.13.0-44-generic firmware=N/A ip=192.168.1.2 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
       resources: irq:18 memory:d0600000-d067ffff memory:bf300000-bf30ffff

This is all from my end as required by you Sir. Your further help will be highly appreciated. Waiting for your earliest reply.

Regards

I cannot find anything wrong in the output that you provided.
What kind of device is at the other end of your Ethernet cable (router, modem etc.)?
Have you verified whether that device is correctly working?
Can you try using a different port of that device?
Do you have a spare cable that you can try instead of the one that you are currently using?

Hello Sir

I am using ADSL 2 type modem.
That modem working fine because it has ethernet as well as wi-fi connection. Wi-fi connection on same device is working flawlessly.
The device have totally 4 ethernet ports. I have already tried to connect the cable at each out of them. Still ethernet is not working. I have also used another ethernet cable, which was working fine in my office. However it is not working with my laptop at home.
I have done with all these alternative. Still problem persist. Is there any issue regarding driver setting.
Provide me solution.

Regards.

Your output
"Ethernet port on my laptop have Green and Yellow LED Indicator. However only green LED indicator continuously run. Yellow indicator runs only at the time of ethernet cable attempts to connect the internet."
points more into the direction of a problem outside sour computer, that wrong driver settings.

What happens to the indicators on your computer's network port, if you unplug the cable from your computer, wait 20 seconds and re-plug the cable,
And similar, what happens to the indicators on your computer if you unplug the cable on the modem side, wait 20 seconds and re-plug it?

Respected Sir

I really appreciate your valuable help

As suggested by you I tried to plug and unplug ethernet cable at the end of my laptop. Green light continuously goes on. However yellow light keeps on blink on interval as the attempts goes for connecting to internet. When I unplug my ethernet cable, both green and yellow lights turns off.

Same happens when I try to connect the ethernet cable at the modem end.

That's all. Please support me further.

Regards.

Hello Sir

I tested the setting of my modem. Therein in device status in interface setup, physical ports were disabled. I enabled those again and now my ethernet connection works fine.

Thank you very much for assistance. I will always anticipate the co-operation of all contributors of launchpad forum.
Thank you all.

Thanks Manfred Hampl, that solved my question.