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
  • 4,687
Dave
  • 21

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
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ChaCha
  • 21
  • 1
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
  • 1,619
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
  • 119,640
Cephas-ibnJAH
  • 31
  • 1
  • 7