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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.

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  • 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 2, 2012 at 13:25
  • Not a cable problem, checked the hardware. Laptop works fine when connected to the cable.
    – Dave
    May 2, 2012 at 15:31
  • Okay, I just wanted to throw that out there...
    – TheXed
    May 2, 2012 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. May 2, 2012 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 3, 2012 at 22:30

3 Answers 3

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:

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.... :)

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.

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