[已解决]网络管理已禁用

lovni

本来好好的，今天实然就提示“网络管理已禁用”。linux基础太薄，遇到点问题就抓瞎了……请大家帮忙看看怎么解决。
用的Kubuntu
以下是在命令行下的尝试及反馈：
~$ iwlist wlan0 scan                              
wlan0     Failed to read scan data : Network is down        

~$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11bg  ESSIDff/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=0 dBm   
          Retry  long limit:7   RTS thrff   Fragment thrff         
          Power Managementff                                          
                                                                        
~$ iwconfig wlan0 txpower on                                 
Error for wireless request "Set Tx Power" (8B26) :                     
    SET failed on device wlan0 ; Operation not permitted.               
~$ sudo iwconfig wlan0 txpower on                                 
[sudo] password for ****:                                                   

~$ sudo NetworkManager

** (NetworkManager:1889): WARNING **: NetworkManager is already running (pid 1120)

~$ dhclient wlan0
Internet Systems Consortium DHCP Client V3.1.3
Copyright 2004-2009 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

can't create /var/lib/dhcp3/dhclient.leases: Permission denied
SIOCSIFADDR: Permission denied
SIOCSIFFLAGS: Permission denied
SIOCSIFFLAGS: Permission denied
Open a socket for LPF: Operation not permitted
~$ sudo dhclient wlan0
Internet Systems Consortium DHCP Client V3.1.3
Copyright 2004-2009 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/wlan0/00:14:78:79:2c:53
Sending on   LPF/wlan0/00:14:78:79:2c:53
Sending on   Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 18
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 19
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 5
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

lovni

看来我的问题太低级

学着用命令行，不用knetworkmanager了

heshuaikun

你往/etc/network/interfaces文件里添加任何配置都会同时禁用networkmanager!  你要使用networkmanager的话把interfaces文件的内容清空，或者把这个文件删掉，别用任何会修改/etc/network/interfaces文件的软件。