My network card is there, and the wire connection is good. But I don't know why there is no working wired connection.The following is some information you may need.john@john-To-be-filled-by-O-E-M ~ $ sudo lshw -C network  *-network                      description: Ethernet interface       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller       vendor: Realtek Semiconductor Co., Ltd.       physical id: 0       bus info: pci@0000:03:00.0       logical name: enp3s0       version: 06       serial: 90:2b:34:45:1f:44       size: 10Mbit/s       capacity: 1Gbit/s       width: 64 bits       clock: 33MHz       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168e-3_0.0.4 03/27/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s       resources: irq:25 ioport:d000(size=256) memory:f2104000-f2104fff memory:f2100000-f2103fffThe output of ifconfig:john@john-To-be-filled-by-O-E-M ~ $ sudo ifconfig -aenp3s0    Link encap:Ethernet  HWaddr 90:2b:34:45:1f:44                                 UP BROADCAST MULTICAST  MTU:1500  Metric:1                                    RX packets:16 errors:0 dropped:0 overruns:0 frame:0                             TX packets:53 errors:0 dropped:0 overruns:0 carrier:0                            collisions:0 txqueuelen:1000                                                      RX bytes:990 (990.0 B)  TX bytes:8473 (8.4 KB)                            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:10871 errors:0 dropped:0 overruns:0 frame:0                                    TX packets:10871 errors:0 dropped:0 overruns:0 carrier:0                                    collisions:0 txqueuelen:1                                                                     RX bytes:1111323 (1.1 MB)  TX bytes:1111323 (1.1 MB)The output of /etc/network/interfaces:john@john-To-be-filled-by-O-E-M ~ $ sudo cat /etc/network/interfaces# interfaces(5) file used by ifup(8) and ifdown(8)auto loiface lo inet loopback
RTL8168 network card doesn't work on Linux Mint 18
linux;ubuntu
You need a working internet connection , then compile the right driver r8168 Enable the universe repo by adding the following line to your sources.list:deb http://de.archive.ubuntu.com/ubuntu/ xenial main restricted universeUpdate and install the r8168-dkms package :sudo apt-get update sudo apt-get install r8168-dkmsReboot your system 