internet - Wired Connection Suddenly stopped working on ubuntu 12.04 after update
2014-04
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!!!
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.
Wired properties carrier is off; must activate it:
echo on | sudo tee /sys/class/net/eth0/device/power/control
I face a login loop and I am unable to login.
I tried reinstalling lightdm, ubuntu-desktop, but doesnt help. I installed gdm and used it as my default for a while to see if it was a lightdm issue.
But here it seems like that there are 3 incorrect password attempts on something that starts when I login. I think my sudoers file is correct.
Here is my auth.log -
May 23 14:52:01 ubuntu-desktop lightdm: pam_unix(lightdm:session): session closed for user lightdm
May 23 14:52:02 ubuntu-desktop lightdm: pam_unix(lightdm:session): session opened for user angad by (uid=0)
May 23 14:52:02 ubuntu-desktop lightdm: pam_ck_connector(lightdm:session): nox11 mode, ignoring PAM_TTY :0
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): conversation failed
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): auth could not identify password for [angad]
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): conversation failed
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): auth could not identify password for [angad]
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): conversation failed
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): auth could not identify password for [angad]
May 23 14:52:02 ubuntu-desktop sudo: angad : 3 incorrect password attempts ; TTY=unknown ; PWD=/home/angad ; USER=root ; COMMAND=/bin/bash
May 23 14:52:05 ubuntu-desktop lightdm: pam_unix(lightdm:session): session closed for user angad
May 23 14:52:06 ubuntu-desktop lightdm: pam_unix(lightdm:session): session opened for user lightdm by (uid=0)
May 23 14:52:06 ubuntu-desktop lightdm: pam_ck_connector(lightdm:session): nox11 mode, ignoring PAM_TTY :0
May 23 14:52:07 ubuntu-desktop lightdm: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "angad"
May 23 14:52:07 ubuntu-desktop dbus[936]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.166" (uid=104 pid=7935 comm="/usr/lib/indicator-datetime/indicator-datetime-ser") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination=":1.17" (uid=0 pid=1426 comm="/usr/sbin/console-kit-daemon --no-daemon ")