我刚刚从 Ubuntu 14.10 升级到 15.04。以太网现在不再被识别。如果我从系统设置中打开网络并单击有线，它会显示
Wired Disconnected - 1000 Mb/s
Hardware Address 00:90:F5:C7:69:B7
并且界面处于“关闭”状态。如果我单击“打开”，它会短暂显示“连接失败”消息并立即关闭。如果我拔掉电缆，消息将更改为：
Wired Cable Unplugged
我有：
% lspci -nnk | grep -iEA3 "(ethernet|network)"
03:00.0 Ethernet controller [0200]: JMicron Technology Corp. JMC250 PCI Express Gigabit Ethernet Controller [197b:0250] (rev 05)
Subsystem: CLEVO/KAPOK Computer Device [1558:7100]
Kernel driver in use: jme
03:00.1 System peripheral [0880]: JMicron Technology Corp. SD/MMC Host Controller [197b:2392] (rev 90)
--
04:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6230 [Rainbow Peak] [8086:0091] (rev 34)
Subsystem: Intel Corporation Centrino Advanced-N 6230 AGN [8086:5201]
Kernel driver in use: iwlwifi
05:00.0 FireWire (IEEE 1394) [0c00]: JMicron Technology Corp. IEEE 1394 Host Controller [197b:2380] (rev 30)
我也尝试过：
% ifconfig eth0 down
% ifconfig eth0 up
% /usr/bin/sudo service networking restart
% /usr/bin/sudo service network-manager restart
我运行了 modprobe 并得到：
% sudo modprobe eth0
modprobe: FATAL: Module eth0 not found.