2

After upgrading to 12.04 my interent connection no longer works. More precisely it is really, really, slow, and occasionally will connect, but do so only for a few moments and then disappear again. I am on a Lenovo Workstation e20.

Output of ifconfig:

 eth0      Link encap:Ethernet  HWaddr 70:f3:95:00:64:3e  
           inet addr:192.168.1.20  Bcast:192.168.1.255  Mask:255.255.255.0
           inet6 addr: fe80::72f3:95ff:fe00:643e/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:7398 errors:0 dropped:74 overruns:0 frame:0
           TX packets:6684 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000 
           RX bytes:5407828 (5.4 MB)  TX bytes:854343 (854.3 KB)
           Interrupt:20 Memory:fb120000-fb140000 

 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:1587 errors:0 dropped:0 overruns:0 frame:0
           TX packets:1587 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0 
           RX bytes:152089 (152.0 KB)  TX bytes:152089 (152.0 KB)

I am really at a loss for what to do. I am relatively new to Ubuntu, searched the other user questions and couldn't figure this out.

Mostafa Ahangarha
  • 4,408
Dave
  • 21
  • I had this problem not to long ago... turned out it was the network cable... Not sure how or why... but maybe something you might want to consider looking into... – TheXed May 02 '12 at 13:25
  • Not a cable problem, checked the hardware. Laptop works fine when connected to the cable. – Dave May 02 '12 at 15:31
  • Okay, I just wanted to throw that out there... – TheXed May 02 '12 at 15:39
  • Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information. – Jorge Castro May 02 '12 at 20:26
  • It is a Lenovo e20 Workstation. When I get home I'll run the terminal commands to get the required info and update. In the meantime I know it is using the e1000e driver (as I started to looking into that to see if that was the problem). – Dave May 03 '12 at 22:30
  • Running lspci I get: Ethernet Controller: Intel Corporation 82578DM Gigabit Network Connection (rev 06) – Dave May 04 '12 at 12:05
  • Okay so for what it is worth, the problem seems to be related to the internal ethernet card. I have hooked up a usb wireless card and don't seem to be having any problems. – Dave May 09 '12 at 13:11

3 Answers3

2

I encountered the same problem after upgrading to 12.04 LTS.

The following solution worked for me.

Open this file in a text editor as root:

/etc/network/interfaces

(One way to do that is gksu gedit /etc/network/interfaces.)

Add these lines to the file:

auto eth0
iface eth0 inet dhcp

Save the file and quit the text editor.

Now restart the network:

Community
  • 1
ChaCha
  • 21
0

Try this : Press Ctrl+Alt+T and then enter this in the command prompt :

echo on | sudo tee /sys/class/net/eth0/device/power/control

After that, retry connecting

. It should connect then.... :)

kelvinelove
  • 1,617
  • 1
  • 16
  • 26
0

To restart the network interfaces:

ifconfig (network interface) down && ifconfig (network interface) up

where (network interface) is the network interface id - eth0 or wlan0.

Eliah Kagan
  • 117,780
Cephas-ibnJAH
  • 31