How to fix Network Manager Disabled problem in ubuntu 10.04 (Lucid)

If your network manager is not working, and says unmanaged, or Networking disabled in ubuntu 10.04 try this fix
Open the terminal from Applications menu -> Accessories -> Terminal run the following commands

service network-manager stop

rm /var/lib/NetworkManager/NetworkManager.state

service network-manager start

Then reboot your system.

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54 thoughts on “How to fix Network Manager Disabled problem in ubuntu 10.04 (Lucid)

  1. My first 15 minutes of experience with any linux was a networkmanager crash. it took me several hours of trying to cope with it myself (I thought that I’m doing something wrong), yet it seems that after n-teen years of development Linux still fails at simple tasks.
    Thankfully it’s not my computer I set up linux on.

    Anyways, back to the topic: neither the commands worked, nor the manual operation (the file cannot be edited or deleted, despite I made my account member of all possible groups). What’s up with that? I should have typed some more magic, maybe?
    Eventually I’ve solved an issue by killing the process (Knetworkmanager, like if that K was necessary?) and suspending to disk. Hopefully one of the fixes that are currently being downloaded solves the issue. I just hope for it.

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  2. @mctom: the “more magic” is “sudo” before each command –

    sudo service network-manager stop
    … etc.

    “sudo” runs the command as the root user, which is not the same (has more powers) even than making your user a member of all admin groups.

    Maybe the OP is running always as root (!!!! gasp!) and didn’t think of sudo because of that.

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  3. any more ideas ? , its not working at all , with root also,

    thanks in advance ,

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    Wiley Reply:

    1.) Check in file /etc/NetworkManager/nm-system-settings.conf and after [ifupdown] there should be managed=true (if false then change to true, otherwise network interfaces such as eth0 or wlan0 will have to be managed manually or by some other script)

    2.) [at prompt type] sudo chmod 600 /etc/NetworkManager/system-connections/* (the files in this directory must be read-only by root only or NM will ignore them and there will be a log entry in /var/log/syslog if NM rejects due to “insecure configuration”

    3.)[at prompt type] rm /var/lib/NetworkManager/NetworkManager.state (“rm” means “remove”, is like “del” in DOS, if that helps)

    4.) [at prompt type]service network-manager restart

    Viola! rebooting should not be required – It ain’t Windows.

    [Reply]

    Shoeb Reply:

    Great work. This one saved a million hours and headache too :D

    Thanks again.

    [Reply]

  4. Alternatively:

    sudo stop network-manager
    sudo rm -f /var/lib/NetworkManager/NetworkManager.state
    sudo start network-manager

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  5. This is great thank you! And yes, used sudo before each command.
    The irony is that to look this up & make ubuntu work I used my laptop that runs on windows

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  6. I just thought I would let you know this helpful post is still being found and used. Thanks a lot. I used the Ubuntu server install to create a RAID0 system, then installed ubuntu-desktop to get a GUI. This post helped me fix one of the few bugs I had.

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  7. It worked but after reboot again same issue, wireless network is not detecting. above commands seems not persistent across reboot. anybody have faced same issue?

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    Amit Reply:

    for me ubuntu was booting up w/o completing network configuration. So restarting network manager was resolving issue and same problem again after a reboot. if u are facing same problem below link can be helpful to resolve issue.
    http://askubuntu.com/questions/213614/waiting-for-network-configuration-problem

    [Reply]

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