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I have got this issue with Ubuntu 10.10. I have been with Ubuntu 8.04 and then decided to try out Ubuntu 10.10 .

I booted with a LiveCD and was able to configure the wireless network painlessly using the livecd. So happily I installed Ubuntu 10.10. As soon as Ubuntu came up it detected the wireless network and I was able to assign a static IP to eth1 (i dont use DHCP option on my ADSL router) and enter a wap key and use pppoeconf to configure the dialer. The net was on and I was able to surf the net. All hunky dory so far. However on the next boot the fun started. It did not detect the wireless network. I could not see the network manager icon in the systray. I used ifconfig and saw that the entry for eth1 was missing. I used ifup eth1 and it said that eth1 was already up .

Then I installed wifi-radar. Wifi-Radar detected the wireless network. I configured wifi-radar for the detected wireless network , set the wap driver as wext and used the manual IP settings. However on clicking connect wifi-radar started looking for a DHCP IP , needless to say it failed. For the love of god I cannot understand why wifi-radar is using DHCP when I have specified manual settings .

Next I decided to use the wired network to surf the net looking for a solution . So I plugged in the network cable from my modem , it detected the plugged in connection , I configured eth0 , used pppoeconf and connected to the net. Then I foolishly decided to reboot my PC. And wonders of wonders , the same problem appeared. I cannot see eth0 in my ifconfig anymore. I used pon to start the dsl-provider connection and it said something about network error or something . Now my ifconfig shows only lo , both eth0 and eth1 have disappeared. Can anybody help me on this?

Is it a problem with ipv6 , if so how do you disable ipv6 on Ubuntu 10.10 ? OR is this is a known issue with Ubuntu 10.10?

P.S.

  1. I tried Linux mint 10 and had the same issue. On rebooting wireless network was not getting detected .
  2. I have made myself the administrator so that there is no issue of rights or anything.
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1  
what's with the downvote favorite remark? up/down votes aren't supposed to be about if you are "happy" about an issue, but if a question is constructive. this appears to be a legitimate concern... –  hbdgaf Jan 17 '11 at 10:26
    
If you don't have anything against NetworkManager, you may try and see if things work with that. Check these two questions I posted a while ago: askubuntu.com/questions/9958/… and unix.stackexchange.com/questions/4261/… –  Mussnoon Jan 17 '11 at 11:43
    
@aking1012 .. i have no clue about the downvote upvote .. i have not touched anything there –  user9054 Jan 18 '11 at 4:45
    
@Mussnoon .... issue solved .. Used WiCD instead of networkmanager and it sorted out things ... seems like NetworkManager has some issues in 10.10 –  user9054 Jan 18 '11 at 4:47
    
Possible Duplicate Wired and Wireless Network Issues with PPPoE –  Marco Ceppi Jan 18 '11 at 14:22

4 Answers 4

In order for Network Manager to manage your wireless connection, your wireless interface must NOT be listed in /etc/network/interfaces. But pppoeconf adds it. So what you need to do is remove it.

Edit /etc/network/interfaces by opening a terminal and typing

sudo gedit /etc/network/interfaces

and delete the following lines:

auto wlan0
iface wlan0 inet manual

Restart, and you should be good to go.

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. yup ... will try this one out .. though i dont get the point of NetworkManager going for a toss when your wireless interfaces are listed in the interfaces file .. i remember my interfaces file containing a entry for eth1(wireless) and network manager working OK in ubuntu 8.04... –  user9054 Jan 19 '11 at 5:15

Make sure you've read the Ubuntu documentation on Wireless troubleshooting, which is available at https://help.ubuntu.com/community/WifiDocs/WirelessTroubleShootingGuide/

I've recently had a relative with a similar issue on his laptop. It turned out that the wireless card was disabled, and Fn + F12 had to be pressed to turn it on (it may differ on your computer, e.g. a switch in front of the laptop). The command rfkill list should show "no" twice on Soft/ Hard blocked for "Wireless LAN".

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the issue was with networkmanager ... installed wicd and its all ok now ... –  user9054 Jan 19 '11 at 5:17

According to the questioner, using wicd solved the problem.

sudo apt-get install wicd
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I'm writing this as an answer (1) to clear the unanswered queue (2) the questioner has neglected to do so for eight months. –  djeikyb Aug 12 '11 at 3:13

I happens to me every time I configure pppoe after a fresh install. After the reboot the network connections becomes unmanageable. You need to do the following: open terminal and type: sudo gedit /etc/NetworkManager/NetworkManager.conf

you will find your connection there and changed "managed=false" to "managed=true" and then restart you system. You will be able to get your network up and running again

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