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Thread: after update - blows out network.

  1. #1
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    after update - blows out network.

    After this update it blew out my network capability. I can run ubuntu utopic fine from recovery mode but not from normal mode. Tried to delete/edit/create new connection but still does not work. I was able to resolve that bug in recovery with update,dist-upgrade .. but no network in normal.

    http://ubuntuforums.org/showthread.p...5#post13003665

    Just a side note. This happened on an install that I was experimenting on with some not so orthodox testing methods. I guess I was trying to break it and I did lol

    I have two Utopic installs on the same machine. This one (I am typing from now) is working great so if I do not find another solution to fix it I can always harvest what little data I have there and do a clean install.
    Last edited by ventrical; April 28th, 2014 at 07:02 AM.
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  2. #2
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    Re: after update - blows out network.

    I have the same problem, it's DNS problem, I just add name servers to /etc/resolve.conf, and networking is back up again.

  3. #3
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    Re: after update - blows out network.

    Quote Originally Posted by cariboo907 View Post
    I have the same problem, it's DNS problem, I just add name servers to /etc/resolve.conf, and networking is back up again.
    I too have lost network connectivity following an update. Symtom was dnsmasq service running, user = nobody and consuming 50% CPU. Stopping that service allowed correct network connectivity.

    I have been seeking way to prevent that service from starting at boot but can find no obvious entry.

    Could you please elaborate on the solution that you adopted?

    Edit
    Bug 998712 seems to offer the solution. Is this what you did? Sorry, ignore this old bug.
    Last edited by Alan F; April 28th, 2014 at 11:55 AM.

  4. #4
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    Re: after update - blows out network.

    Quote Originally Posted by cariboo907 View Post
    I have the same problem, it's DNS problem, I just add name servers to /etc/resolve.conf, and networking is back up again.
    @cariboo907

    I get:

    Code:
    # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
    #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
    nameserver 127.0.1.1
    search gateway.2wire.net
    Do I just add it in below the last line?
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  5. #5
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    Re: after update - blows out network.

    Quote Originally Posted by Alan F View Post
    I too have lost network connectivity following an update. Symtom was dnsmasq service running, user = nobody and consuming 50% CPU. Stopping that service allowed correct network connectivity.

    I have been seeking way to prevent that service from starting at boot but can find no obvious entry.

    Could you please elaborate on the solution that you adopted?

    Edit
    Bug 998712 seems to offer the solution. Is this what you did? Sorry, ignore this old bug.

    For what it's worth I me tooed it .. but then relaized it is an old bug.
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  6. #6
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    Re: after update - blows out network.

    Quote Originally Posted by Alan F View Post
    I too have lost network connectivity following an update. Symtom was dnsmasq service running, user = nobody and consuming 50% CPU. Stopping that service allowed correct network connectivity.

    I have been seeking way to prevent that service from starting at boot but can find no obvious entry.

    Could you please elaborate on the solution that you adopted?

    Edit
    Bug 998712 seems to offer the solution. Is this what you did? Sorry, ignore this old bug.
    That temp patch is working here now. (end dnsmasq service)

    Regards..
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  7. #7
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    Re: after update - blows out network.

    I was posting from my smart phone, when I answered the first post, it was a little hard to elaborate, as I was no where near my desktop. My /etc/resolv.conf looks like this:

    Code:
    cat /etc/resolv.conf
    # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
    #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
    nameserver 127.0.1.1
    nameserver 192.168.0.1
    nameserver 8.8.8.8
    Of course this is a temporary fix, as /etc/resolv.conf gets over written every time you reboot. The problem happened on all my Utpoic installs, I've got Gnome-shell, Lubuntu and Xubuntu running in vbox, and editing /etc/resolv.conf resolved the problem temporarily on all installs.

    I'm considering setting up networking manually until the problem is solved.

    My /etc/network/interfaces will look something like this:

    Code:
    cat interfaces
    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5).
    
    # The loopback network interface
    auto lo
    iface lo inet loopback
    
    # The primary network interface
    auto eth0
    iface eth0 inet static
    	address		192.168.0.210
    	netmask	255.255.255.0
    	broadcast	192.168.0.254
    	gateway	192.168.0.1
    	dns-nameserver	8.8.8.8 192.168.0.1

  8. #8
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    Re: after update - blows out network.

    Quote Originally Posted by cariboo907 View Post

    I'm considering setting up networking manually until the problem is solved.

    [/code]
    Simply stopping manually the dnsmasq service will allow normal operation.

    Does anyone know how to prevent it from starting?

    You cannot just remove dnsmasq-base as it wants to take network-manager etc with it and the config files mentioned in various posts just do not seem to exist.
    Last edited by Alan F; April 28th, 2014 at 05:29 PM.

  9. #9
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    Re: after update - blows out network.

    This appears to provide a patch for the above problem.

    In /etc/NetworkManager/NetworkManager.conf

    Comment out the line dns=dnsmasq

  10. #10
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    Re: after update - blows out network.

    Quote Originally Posted by Alan F View Post
    This appears to provide a patch for the above problem.

    In /etc/NetworkManager/NetworkManager.conf

    Comment out the line dns=dnsmasq
    Works great ... but network notification icon is gone on gnome-session menu bar now.
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