Question

1

How to let NetworkManager manage WLAN interface after upgrade?

rated 0 times [ 1] [ 0] / answers: 1 / hits: 8164 / 3 Years ago, fri, may 14, 2021, 9:57:52

I upgraded a Ubuntu system from 11.04 to 11.10 via do-release-uprade.

Now some things does not work as before.

For example now, my user needs to be part of the scanner group to be able to use xsane etc. - with < 11.10 this apparently was not necessary.

To be able to use nm-applet again (for wired networking) I needed to add the user to the group netdev after the upgrade.

But WLAN management still does not work via NetworkManager - nm-applet just does not display any wireless devices.

In the logs there is:

NetworkManager wlan0 deactivating device reason managed

(inter-punctuation removed)

But why it is suddenly managed?

I checked /etc/network/interfaces and it does not contain any wlan0 entries.

And /etc/NetworkManager/NetworkManager.conf just contains:

[main]

plugins=ifupdown,keyfile



[ifupdown]

managed=true

Is there some other group the user needs to be part of? Or what else could be messed up after an upgrade?

Manually connecting to a WLAN-AP via wpasupplicant and dhclient (after stopping NetworkManager) works perfectly fine.

Edit: Btw, this Ubuntu system is a little bit non-standard:

wdm is configured as display manger instead of lightdm

as window manager I use awesomewm

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fulild

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answered 3 Years ago ouschee · Accepted Answer

Please backup before you use the commands below, I don't know if you will have internet afterwards.

Connect using ethernet cable.

Download the packages so you have a way to reinstall them even without internet:
```
cd

apt-get download network-manager-gnome network-manager
```

Then I'd suggest to purge your network manager configuration:

sudo apt-get purge network-manager-gnome network-manager

sudo rm -rf /etc/NetworkManager

sudo rm -rf /usr/lib/NetworkManager

sudo rm -rf /var/lib/NetworkManager

And reinstall network manager:
```
sudo apt-get install network-manager-gnome network-manager
```
If you don't have internet anymore try installing the local packages we downloaded with the first command:
```
cd

sudo dpkg -i network-manager*.deb
```

Restart the computer.

If the above commands did not fix the internet, we need more info:

Run these commands and provide the output (edit your question):

sudo apt-get dist-upgrade

cat /etc/network/interfaces

iwconfig

ifconfig

lspci -nn

lsusb

nm-tool

sudo lshw -C network

rfkill list all

Check that you have all the dependencies installed correctly, reinstall the ubuntu meta-packages:

sudo dpkg -P --force-all ubuntu-desktop ubuntu-standard ubuntu-minimal

sudo apt-get install ubuntu-desktop ubuntu-standard ubuntu-minimal

You never mentioned which Ubuntu version you used before you upgraded to 11.10.

Note: By the way, AFAIK the do-release-uprade command should be used when upgrading server installations, not desktop. You should prefer downloading the alternate cd of the through update-manager.