August 3, 2010 · Networking · Email This Post

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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52 Comments to “How to fix Network Manager Disabled problem in ubuntu 10.04 (Lucid)”

  1. mctom says:

    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.


  2. chris says:

    it worked. thank you.


    why0712 Reply:

    Thank you for your post. It worked instantly.


  3. James says:

    @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.


  4. Mayank says:

    Thanks a lot for the information.
    It works.


  5. Skyler says:

    Thanks a lot man it worked :D


  6. karan says:

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

    thanks in advance ,


    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.


    Shoeb Reply:

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

    Thanks again.


  7. Brijin Sasankan says:

    Thanks for the fix! It worked for me.


  8. qwertyuiop says:

    Fixed in Maverick and newer.


  9. irfan patel says:

    Thank u tons of time!!!!


  10. John says:

    Thank you so much! This is just what I needed!


  11. jamo says:

    Thanks! Worked 100% on PowerPC


  12. V says:

    thanks, it worked :)


  13. Colin says:


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


  14. Uriel says:

    the suggestion of Colin is great !


  15. dlm says:

    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


  16. lmeyro says:

    I tried entering the commands it said commands not recognized…


  17. Edmond says:

    Would this work from root in ubuntu 12.10, please?


  18. Sanil Kumar says:

    now its working for me.

    thanks alot.


  19. John Kirk says:

    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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