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I am running Xubuntu (12.04 LTS) and something is wrong with my network settings (for wireless network using DHCP and WPA). Whenever I reboot, after the access to the network is not working unless I restart the network or at least the wlan0 interface:

sudo ifdown wlan0
sudo ifup wlan0

The configuration in /etc/network/interfaces seems to be correct, because when I restart networking it is working correctly. Any ideas?

EDIT:

In the panel the network manager shows the wireless networks as 'not managed', before and after restarting the network.

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We will need to know what kind of wireless card you have and as much detailed information as possible about your system. –  Richard Sep 16 '13 at 19:04
    
The wireless card is from Intel (3945ABG, Golan) which seems to be supported. The machine has Intel Core 2 CPU and runs kernel version 3.2.0-53-generic and Ubuntu 12.04 with Xfce Desktop Environment v4.8. –  natascha Sep 16 '13 at 19:24
    
Im guessing you want NetworkManager to manage your connection as this is the norm on most laptops if so you shouldn’t be using /etc/network/interfaces I'd remove all references to wlan[?] from there. Reboot and list if network manager panel is showing your connected etc.. –  Shutupsquare Sep 16 '13 at 19:54
    
Perfect, this actually solved my problem and it is automatically connecting now using the network manager. Thanks! –  natascha Sep 16 '13 at 20:05
    
Okay i'll add it as an answer then. –  Shutupsquare Sep 16 '13 at 20:15
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1 Answer 1

Im guessing you want network-manager to manage your connection as this is the norm on most laptops if so you shouldn’t be using /etc/network/interfaces I'd remove all references to wlan[?] from their and reboot.

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