Comments on: Ubuntu 9.04 “Wired Network – device not managed”

By: Ankur Arora

Ankur Arora — Fri, 13 May 2011 11:44:47 +0000

Thanks this worked for me.

Just one change — instead of restarting networking as you suggested:
> sudo /etc/init.d/networking restart
> pkill nm-applet
> nm-applet

what needs restarting is network-manager
> sudo /etc/init.d/network-manager restart

As soon as I do that my Wired connection shows up.

By: Carlos

Carlos — Sun, 30 May 2010 21:15:15 +0000

Hi, me again.

I’ve solved the previous problem.

Just comment all interfaces except loopback interface. You can also use that to establish the iptables rules. For example, my /etc/network/interfaces file:
auto lo
iface lo inet loopback
pre-up iptables-restore < /etc/iptables.rules

## The primary network interface
#allow-hotplug eth0
#iface eth0 inet dhcp

Now you can do ping to localhost or connect with your own localhost server.

Good luck and thanks!

Carlos

By: Carlos

Carlos — Wed, 26 May 2010 11:19:05 +0000

Hi, me again.

It works but if you have a server (for example apache). It desapears. Do you know how can i solve that? Thanks:
$ sudo /etc/init.d/apache2 restart
Restarting web server: apache2 … waiting .

$ sudo nmap localhost -PN

Starting Nmap 5.00 ( http://nmap.org ) at 2010-05-26 13:15 UTC
Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1.
All 1000 scanned ports on localhost (127.0.0.1) are filtered

Nmap done: 1 IP address (1 host up) scanned in 201.37 seconds

Thanks

By: Carlos

Carlos — Mon, 24 May 2010 20:59:49 +0000

It works but need to restart. Thanks! ;)

By: Ian Leader

Ian Leader — Sun, 02 May 2010 13:10:39 +0000

I think I was suffering from this problem because of a switch to wicd (and then back to Network Manager) in a vain attempt to fix a wireless network card problem.

Like Amul, I needed to restart the Network Manager before it worked – now it’s fine. Thanks!

By: Amul

Amul — Mon, 29 Mar 2010 15:37:10 +0000

If the above steps don’t work, try restarting the network manager.

sudo /etc/init.d/network-manager restart

By: enos76

enos76 — Sun, 28 Feb 2010 18:50:48 +0000

Will they ever make the interfaces file and the nm-applet work in harmony? This is ridiculous.

By: John

John — Sun, 21 Feb 2010 19:19:17 +0000

Thank you so much for this workaround! I’d been unable to connect to anything but my wireless network for the past year or so. This speeds things up tremendously.

By: Will

Will — Mon, 01 Feb 2010 01:39:59 +0000

Thank you. It works!
I have been bothered by the question for a long time. After reading your article, I was eagle to try it. It really works on my Ubuntu 9.10. Thanks again!

By: Martin

Martin — Mon, 04 Jan 2010 17:03:53 +0000

Had the same problem but solved it by changing [ifupdown] managed=false to true in /etc/NetworkManager/nm-system-settings.conf