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Thread: Lubuntu upgraded to 12.10 from 12.04 DNS not working

  1. #1
    Join Date
    Oct 2012
    Beans
    9

    Lubuntu upgraded to 12.10 from 12.04 DNS not working

    Hello, I upgraded my Lubuntu 12.04 (which was working fine) to 12.10 today and I've encountered the following problem:

    DNS does not seem to be working correctly, it looks like the DNS settings I set in Network-Manager are not saved/used correctly.

    If I type
    Code:
    nslookup www.google.com
    in a terminal window I get a timeout.

    If I type
    Code:
    nslookup www.google.com 8.8.8.8
    in a terminal window I get a response.

    Everything dependent on DNS is not working (firefox etc.)

    It thought my router might be the culprit because sometimes DNS fails using the router, however if I type
    Code:
    nslookup www.google.com a.b.c.d
    (router ip) I get replies.

    Anyway, I tried to change the DNS address in the network-manager configuration to 8.8.8.8 with DHCP enabled for the IP-address.
    After reconnecting/rebooting nslookup shows the same behaviour.

    I've found some info on the internet mentioning dnsmasq which might cause trouble:
    https://bugs.launchpad.net/ubuntu/+s...r/+bug/1031350

    However, I am not sure if this is the problem in my case because I do have the dnsmasq.d folder mentioned in the bug report.

    Does somebody have an idea of what might be wrong?
    Last edited by SwiftPengu; October 19th, 2012 at 12:48 PM. Reason: improved aesthetics and readability

  2. #2
    Join Date
    Oct 2012
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    9

    Re: Lubuntu upgraded to 12.10 from 12.04 DNS not working

    As a temporary fix I was able to install wicd from the 12.04 repositories, and update it to the 12.10 version with my renewed connection.

    I needed at least the following packages (I tried sudo apt-get build-dep on a ubuntu 12.04 install, and then obtained the remaining packages):
    -po-debconf
    -python-wicd
    -wicd-daemon
    -wicd-gtk

  3. #3
    Join Date
    Nov 2010
    Beans
    12

    Re: Lubuntu upgraded to 12.10 from 12.04 DNS not working

    I have the same problem after upgrading Lubuntu to 12.10. Could you pleace describe in more detail how you resolved the issue? Thanks

  4. #4
    Join Date
    Oct 2012
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    9

    Re: Lubuntu upgraded to 12.10 from 12.04 DNS not working

    Hi, unfortunately I cannot be very precise. What I did was as follows:

    1.Boot into my ubuntu 12.04 install
    2.Run
    Code:
    sudo apt-get build-dep wicd
    3.Do not install anything (by selecting no when asked), but note the package names mentioned under "the following packages will be installed"
    4.Use
    Code:
    sudo apt-get download [package name] [package name]
    to obtain the .deb files for those packages
    5.Boot into Lubuntu and try to install all the .deb files
    6.Note any missing packages (in my case the aforementioned 4 packages)
    7.Boot back in to ubuntu and download the missing packages too
    8.Boot into Lubuntu and install the new packages

    9.From this point it worked on my end and installed wicd instead of network-manager-gnome

    The reason I cannot be very specific on the packages needed is because I used two systems with random extra software installed, so you might also need e.g. build-essentials.

    Also be aware of the fact that this is only a temporary solution as this does not fix any problems but only replaces a misbehaving network manager with a different one.

  5. #5
    Join Date
    Nov 2009
    Location
    Mataro, Spain
    Beans
    13,358
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Lubuntu upgraded to 12.10 from 12.04 DNS not working

    When you set it manually in the connection options it should work. Are you sure you configured it correctly?

    Also, did you change the option to Automatic (address only)? That is needed so that it accepts the manual entries for DNS servers.

    PS. And, which is always a good idea, you don't have to upgrade to a new version the first day it comes out. Wait and see if people start reporting issues with it. Besides, running 12.04 which is LTS and has 5 years support, I don't understand why are you upgrading to 12.10 which has only 18 months of support anyway. Unless it has some options that you can't install or add to 12.04 (which is very rare), you don't even need to upgrade ever.
    Last edited by darkod; October 19th, 2012 at 08:26 PM.
    Darko.
    -----------------------------------------------------------------------
    Ubuntu 14.04 LTS 64bit & Windows 10 Pro 64bit

  6. #6
    Join Date
    Apr 2006
    Beans
    20
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: Lubuntu upgraded to 12.10 from 12.04 DNS not working

    Looks like this is a known issue. The instructions here worked for me:

    https://bugs.launchpad.net/ubuntu/+s...r/+bug/1051348

  7. #7
    Join Date
    Oct 2012
    Beans
    9

    Re: Lubuntu upgraded to 12.10 from 12.04 DNS not working

    I reinstalled gnome-network-manager and removed (not purged) wicd.
    My DNS is now resolving, so it might be that this had been fixed.

    My /etc/resolv.conf is saying this, which is the same as it said with wicd:
    Code:
    domain lan
    search lan
    nameserver 192.168.1.254
    Which points to my router (dns forwarder), however in my settings
    I am using 8.8.8.8 (google dns for testing), and nslookup reports not using 8.8.8.8 but 192.168.1.254:

    Code:
    me@PC:~$ nslookup www.google.com
    Server:		192.168.1.254
    Address:	192.168.1.254#53
    
    Non-authoritative answer:
    Name:	www.google.com
    Address: 173.194.66.103
    Name:	www.google.com
    Address: 173.194.66.105
    Name:	www.google.com
    Address: 173.194.66.147
    Name:	www.google.com
    Address: 173.194.66.99
    Name:	www.google.com
    Address: 173.194.66.106
    Name:	www.google.com
    Address: 173.194.66.104
    My Network-Manager configuration is as follows:


    I am thinking I am now still using my old wicd config file (I have already rebooted), and somehow it is still not overwritten.
    I will try the symlink mentioned in the launchpad bug report tomorrow.

  8. #8
    Join Date
    Oct 2012
    Beans
    9

    Re: Lubuntu upgraded to 12.10 from 12.04 DNS not working

    Since the last time I replied here, I noticed the following things:
    1.If I edit /etc/resolv.conf and put the DNS server I want to use there, it is used.

    2.After symlinking /run/resolvconf/resolv.conf to /etc/resolv.conf
    my system uses the NetworkManager settings

    Code:
    sudo mv /etc/resolv.conf /etc/resolv.conf.bak
    sudo ln -s /run/resolvconf/resolv.conf /etc/resolv.conf

  9. #9
    Join Date
    Mar 2005
    Beans
    211

    Re: Lubuntu upgraded to 12.10 from 12.04 DNS not working

    Quote Originally Posted by SwiftPengu View Post
    Since the last time I replied here, I noticed the following things:
    1.If I edit /etc/resolv.conf and put the DNS server I want to use there, it is used.
    So to begin with /etc/resolv.conf was a plain file.

    Quote Originally Posted by SwiftPengu View Post
    2.After symlinking /run/resolvconf/resolv.conf to /etc/resolv.conf
    my system uses the NetworkManager settings

    Code:
    sudo mv /etc/resolv.conf /etc/resolv.conf.bak
    sudo ln -s /run/resolvconf/resolv.conf /etc/resolv.conf
    Having created this symlink you have given control of /etc/resolv.conf back to resolvconf which NetworkManager uses for maintaining resolv.conf contents. Keep it this way. Resolvconf is now part of the Ubuntu base system and is expected to be present. If resolvconf does not seem to be working properly in some instance then report a bug against the resolvconf package and we will investigate the issue with you.

  10. #10
    Join Date
    Oct 2012
    Location
    In a house
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    46

    Re: Lubuntu upgraded to 12.10 from 12.04 DNS not working

    I had a similar problem on Windows XP. When the DNS WAS working, I copied it onto notepad. I then tweaked the settings to always use that DNS, rather than finding it automatically. If you can do something similar on Lubuntu, it may fix it.

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