我刚刚从 Ubuntu 16.04 升级到 16.10，然后是 17.04，并且在此过程中丢失了有线网络。升级前 4 小时前还好。我可以连接到 WiFi，但以太网在我的网络管理菜单中显示为灰色。这是 ifconfig -a 的输出
ifconfig -a
eth0: flags=4098<BROADCAST,MULTICAST> mtu 1500
ether e8:40:f2:81:23:fa txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 479 bytes …