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I upgraded from Ubuntu 11.10 to 12.04 yesterday. I am running a BSNL Broadband DSL conenction. The wired network suddenly dissapears and the computer stops detecting the ethernet card after sometime. However, after rebooting, it again becomes alright.

$ lspci | grep Ethernet 
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 05)

Specs:

  • Lenovo Ideapad Z570
  • Intel i5 2nd Gen. processor
  • 3 GB RAM
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So what's the problem here? – harisibrahimkv May 2 '12 at 5:45
    
The wired network keeps disappearing. I think its a bug. – sanketsaurav May 2 '12 at 5:52

is it shown in:

ifconfig -a ?

furthermore look at this:

http://mickvaites.com/2009/06/ubuntu-changing-network-device-id-udevrules-d/

uncomment all lines will make Ubuntu to re-setup the network cards, but maybe you can solve your problem in a smarter way with the help of this file.

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No. When the wired network disappears, it does not show in ifconfig -a. Once I reboot, everything becomes fine again. – sanketsaurav May 3 '12 at 8:39
sudo dpkg --configure -a

This solved the problem for me. All configuration files were rewritten including the ones for network-manager. I must add that I have a Intel Corporation PRO/Wireless 4965 AG on a Dell XPS M1530.

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The problem is with your network driver .Ubuntu default network drivers are not supporting. you can fix this by installing a network driver ."compat-wireless-2012-07-03-pc" tis will solve the problem. read this post.it will help you to install the driver

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While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – Pilot6 Sep 29 '15 at 21:31

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