Ubuntu eth0 not detected

Question

After installing a new version of this distro, eth0 is not detected automatically.

command inxi -SNxz result:

Network:   Card-1: Broadcom NetXtreme BCM57786 Gigabit Ethernet PCIe bus-ID: 01:00.0
           Card-2: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter driver: ath9k bus-ID: 02:00.0

command ifconfig -a result:

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0                                   
          inet6 addr: ::1/128 Scope:Host                                        
          UP LOOPBACK RUNNING  MTU:65536  Metric:1                              
          RX packets:1439 errors:0 dropped:0 overruns:0 frame:0                 
          TX packets:1439 errors:0 dropped:0 overruns:0 carrier:0               
          collisions:0 txqueuelen:0                                                                                                                                                             
          RX bytes:129263 (129.2 KB)  TX bytes:129263 (129.2 KB)                                                                                                                                

wlan0     Link encap:Ethernet  HWaddr 40:f0:2f:30:ba:59                                                                                                                                         
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0                                                                                                                        
          inet6 addr: fe80::42f0:2fff:fe30:ba59/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:502798 errors:0 dropped:0 overruns:0 frame:0
          TX packets:287851 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:682169370 (682.1 MB)  TX bytes:26305982 (26.3 MB)

System information detailes:

tux-world@alachiq:~ > sudo uname -a -r
Linux alachiq 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:31:42 UTC 2014 i686 i686 i686 GNU/Linux

Solution

Verify that you have something similar to the following in /etc/network/interfaces

auto eth0
iface eth0 inet dhcp

eth0 could also be referred to as p5p1 or similar according to the modern naming convention.

You can 'restart' all the network interfaces by bringing them down and up again with the following command: ifdown --all --no-loopback && ifup --all --no-loopback or a specific interface, eg: ifup eth0

If your conf seems in order, then try modprobe tg3 and then bring up the network interface using ifup. Might be an issue regarding the drivers or lack thereof.

Comments

[Lawrence]

What's the output of ifconfig -a ?

[Chrispie]

Could you give some details about your system? Which Kernel you're running?