我最近在我的 Ubuntu 16.04 上运行了 sudo apt-get update and upgrade，之后，我的 Ubuntu 无法使用有线连接上网，尽管它显示已连接到以太网。此外，通过无线网络连接时一切似乎都运行正常。以下是我的 ifconfig 输出：
ifconfig
enp7s0 Link encap:Ethernet HWaddr b8:2a:72:cc:87:48
inet addr:192.168.1.39 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::812d:c236:8d77:aed8/64 Scope:Link
inet6 addr: fd50:680a:d634:e900:2116:97ee:4b93:8596/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:80 errors:0 dropped:1 overruns:0 frame:0
TX packets:406 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11276 (11.2 KB) TX bytes:30260 (30.2 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:1239 errors:0 dropped:0 overruns:0 frame:0
TX packets:1239 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:133982 (133.9 KB) TX bytes:133982 (133.9 KB)
wlp6s0 Link encap:Ethernet HWaddr ec:0e:c4:07:15:df
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:7061 errors:0 dropped:1 overruns:0 frame:0
TX packets:4901 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:7589626 (7.5 MB) TX bytes:661641 (661.6 KB)
左心室舒张功能：
lshw -C network
*-network
description: Wireless interface
product: QCA9565 / AR9565 Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:06:00.0
logical name: wlp6s0
version: 01
serial: ec:0e:c4:07:15:df
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=4.4.0-31-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
resources: irq:18 memory:f7900000-f797ffff memory:f7980000-f798ffff
*-network
description: Ethernet interface
product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:07:00.0
logical name: enp7s0
version: 07
serial: b8:2a:72:cc:87:48
size: 100Mbit/s
capacity: 100Mbit/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 autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8106e-1_0.0.1 06/29/12 ip=192.168.1.39 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
resources: irq:41 ioport:e000(size=256) memory:f7800000-f7800fff memory:f2100000-f2103fff
在 /etc/网络/接口：
cat /etc/network/interfaces
auto lo
iface lo inet loopback
低碳环保：
lspci -nnk | grep -e 0200 -e 0280 -A2
06:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01)
Subsystem: Dell QCA9565 / AR9565 Wireless Network Adapter [1028:020c]
Kernel driver in use: ath9k
--
07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 07)
Subsystem: Dell RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [1028:0652]
Kernel driver in use: r8169
LSMOD：
lsmod | grep r816*
r8169 77824 0
mii 16384 1 r8169
我关注了论坛中的几个帖子，使用 Synaptic 安装了 r8168-dkms，添加了
auto enp7s0
iface enp7s0 inet dhcp
到 network/interfaces 文件，但都不起作用。所以，我想这里有人可以帮助解决这个问题。谢谢！