我尝试使用 Ubuntu 14.10 在我的笔记本电脑 HP Pavilion 上连接到互联网，但存在 Ubuntu 无法识别有线连接或以太网适配器的问题：
当我输入时ifconfig，它只显示：
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:181 errors:0 dropped:0 overruns:0 frame:0
TX packets:181 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:13318 (13.3 KB) TX bytes:13318 (13.3 KB)
输入时ifconfig -a：
eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
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:181 errors:0 dropped:0 overruns:0 frame:0
TX packets:181 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:13318 (13.3 KB) TX bytes:13318 (13.3 KB)
当我按照如下说明操作时：
http://www.pcworld.com/article/2455972/how-to-fix-your-internet-connection-in-ubuntu-linux.html
首先，它显示有线连接的“电缆已拔出” - 尽管电缆已连接 - 即使在手动编辑 IPv4 设置后，“保存”按钮仍然关闭。
我尝试按照以下答案进行操作： Ubuntu 服务器无法识别以太网
以下是我所得到的：
ifconfig -a | grep eth给出：
eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
sudo ifdown eth0 && ifup eth0给出：
RTNETLINK answers: No such process
Internet Systems Consortium DHCP Client 4.2.4
Copyright 2004-2012 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
后nano /etc/network/interfaces：
auto eth1
iface eth1 inet static
address 192.168.1.3
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers 8.8.8.8 192.168.1.1
然后sudo ifdown eth1 && sudo ifup -v eth1给了：
ifdown: interface eth0 not configured
Configuring interface eth0=eth0 (inet)
run-parts --exit-on-error --verbose /etc/network/if-pre-up.d
run-parts: executing /etc/network/if-pre-up.d/ethtool
run-parts: executing /etc/network/if-pre-up.d/wireless-tools
run-parts: executing /etc/network/if-pre-up.d/wpasupplicant
ip addr add 192.168.1.3/255.255.255.0 broadcast 192.168.1.255 dev eth0 label eth0
RTNETLINK answers: File exists
Failed to bring up eth0.
将 eth1 更改为 eth0：
safi@safi:~$ sudo ifdown eth0 && sudo ifup -v eth0
ifdown: interface eth0 not configured
Configuring interface eth0=eth0 (inet)
run-parts --exit-on-error --verbose /etc/network/if-pre-up.d
run-parts: executing /etc/network/if-pre-up.d/ethtool
run-parts: executing /etc/network/if-pre-up.d/wireless-tools
run-parts: executing /etc/network/if-pre-up.d/wpasupplicant
ip addr add 192.168.1.3/255.255.255.0 broadcast 192.168.1.255 dev eth0 label eth0
RTNETLINK answers: File exists
Failed to bring up eth0.
我该如何继续？