树莓派3 wlan0升级后不工作

Question

我想让我的树莓派工作。我做了sudo apt-get update && sudo apt-get upgrade，现在无线网络停止工作。 如果这不是问题，我也插入相机。

dmesg没有显示有关wlan0的任何信息。

如果我做sudo ifdown wlan0 && sudo ifup wlan0我得到这个：

ifdown: interface wlan0 not configured 
wpa_supplicant: /sbin/wpa_supplicant daemon failed to start 
run-parts: /etc/network/if-pre-up.d/wpasupplicant exited with return code 1 
Failed to bring up wlan0. 

我没有碰在/ etc /网络/接口文件，以便它默认是这样的：

interfaces(5) file used by ifup(8) and ifdown(8) 

# Please note that this file is written to be used with dhcpcd 
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf' 

# Include files from /etc/network/interfaces.d: 
source-directory /etc/network/interfaces.d 

auto lo 
iface lo inet loopback 

iface eth0 inet manual 

auto wlan0 
iface wlan0 inet manual 
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf 

allow-hotplug wlan1 
iface wlan1 inet manual 
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf 

任何想法应该是错的？

编辑 另外，如果我做的ifconfig，wlan0是不是有

Answer 1

如果有帮助，这里是一个工作配置，它允许PI3自动使用无线连接如果有线的一个不可用：

auto lo 
iface lo inet loopback 
iface eth0 inet dhcp 

allow-hotplug wlan0 
iface wlan0 inet manual 
    wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf 

#this line must always be here 
iface default inet dhcp