Ubuntu 16.04 проблема Ethernet: не может проверить с помощью ping-запросов IP-адрес

Я плохо знаком с Ubuntu, и недавно потерянное интернет-соединение - не может соединиться с 8.8.8.8 или google.com. Я открываю администратора сети, и это говорит, что я соединен с корректным аппаратным адресом и IP-адресом fe80:: 1037:4526:e2b:d5c3. Однако это не IP-адрес моего маршрутизатора Ethernet. Я могу соединиться с этим портом Ethernet через раздел Windows на том же компьютере. IPv4 установлен на Автоматический (DHCP), и IPv6 установлен на Автоматический. Вот вывод некоторых соответствующих команд:

$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 98:90:96:a5:d7:ae brd ff:ff:ff:ff:ff:ff
    inet6 fe80::1037:4526:e2b:d5c3/64 scope link
       valid_lft forever preferred_lft forever

$route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

$dmesg |grep eth0
[    1.603310] e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) 98:90:96:a5:d7:ae
[    1.603311] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
[    1.603348] e1000e 0000:00:19.0 eth0: MAC: 11, PHY: 12, PBA No: FFFFFF-0FF
[    1.603863] e1000e 0000:00:19.0 enp0s25: renamed from eth0

$sudo lshw -c network
  *-network               
       description: Ethernet interface
       product: Ethernet Connection I217-LM
       vendor: Intel Corporation
       physical id: 19
       bus info: pci@0000:00:19.0
       logical name: enp0s25
       version: 05
       serial: 98:90:96:a5:d7:ae
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.13-4 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:28 memory:fb100000-fb11ffff memory:fb139000-fb139fff ioport:f020(size=32)

$ ifconfig -a
enp0s25   Link encap:Ethernet  HWaddr 98:90:96:a5:d7:ae  
          inet6 addr: fe80::1037:4526:e2b:d5c3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10151 errors:0 dropped:0 overruns:0 frame:0
          TX packets:728 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1715192 (1.7 MB)  TX bytes:154706 (154.7 KB)
          Interrupt:20 Memory:fb100000-fb120000

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:23808 errors:0 dropped:0 overruns:0 frame:0
          TX packets:23808 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1798264 (1.7 MB)  TX bytes:1798264 (1.7 MB)

$ more /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

$ vi etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

$ls -al /etc/resolv.conf
lrwxrwxrwx 1 root root 29 Jan  7 06:46 /etc/resolv.conf -> ../run/resolvconf/resolv.conf

$ dpkg -l *dns*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-=================================
ii  dns-root-data  2018013001~1 all          DNS root data including root zone
un  dnscache-run   <none>       <none>       (no description available)
un  dnsmasq        <none>       <none>       (no description available)
ii  dnsmasq-base   2.75-1ubuntu amd64        Small caching DNS proxy and DHCP/
ii  dnsutils       1:9.10.3.dfs amd64        Clients provided with BIND
un  fpdns          <none>       <none>       (no description available)
un  isc-dhcp-clien <none>       <none>       (no description available)
un  isc-dhcp-clien <none>       <none>       (no description available)
un  libapache2-mod <none>       <none>       (no description available)
ii  libdns-export1 1:9.10.3.dfs amd64        Exported DNS Shared Library
ii  libdns162:amd6 1:9.10.3.dfs amd64        DNS Shared Library used by BIND
ii  libnet-dns-per 0.81-2build1 amd64        Perform DNS queries from a Perl s
un  libnet-dns-sec <none>       <none>       (no description available)
ii  libnss-mdns:am 0.10-7       amd64        NSS module for Multicast DNS name
un  pdnsd          <none>       <none>       (no description available)
un  rdnssd         <none>       <none>       (no description available)

$ dpkg -l *resolv*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-=================================
ii  resolvconf     1.78ubuntu6  all          name server information handler

$ ls -al /boot
total 139844
drwxr-xr-x  3 root root     4096 Jan 11 14:24 .
drwxr-xr-x 25 root root     4096 Jan 11 14:21 ..
-rw-r--r--  1 root root  1537161 Jul 18  2018 abi-4.15.0-29-generic
-rw-r--r--  1 root root   216815 Jul 18  2018 config-4.15.0-29-generic
-rw-r--r--  1 root root   217026 Dec  7 11:05 config-4.15.0-43-generic
drwxr-xr-x  5 root root     4096 Jan 11 14:23 grub
-rw-r--r--  1 root root 54459735 Jan  8 06:48 initrd.img-4.15.0-29-generic
-rw-r--r--  1 root root 61868943 Jan 11 14:24 initrd.img-4.15.0-43-generic
-rw-r--r--  1 root root   182704 Jan 28  2016 memtest86+.bin
-rw-r--r--  1 root root   184380 Jan 28  2016 memtest86+.elf
-rw-r--r--  1 root root   184840 Jan 28  2016 memtest86+_multiboot.bin
-rw-r--r--  1 root root        0 Jul 18  2018 retpoline-4.15.0-29-generic
-rw-------  1 root root  4039561 Jul 18  2018 System.map-4.15.0-29-generic
-rw-------  1 root root  4047366 Dec  7 11:05 System.map-4.15.0-43-generic
-rw-r--r--  1 root root  8101496 Jul 30  2018 vmlinuz-4.15.0-29-generic
-rw-------  1 root root  8119768 Dec  8 04:43 vmlinuz-4.15.0-43-generic

$ cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq

[ifupdown]
managed=false

$ cat /etc/systemd/resolved.conf
[Resolve]
#DNS=
#FallbackDNS=8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844
#Domains=
#LLMNR=yes
#DNSSEC=no

$ dmesg |grep -i dhcp
[   12.059135] audit: type=1400 audit(1551975180.569:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=534 comm="apparmor_parser"
[   12.059137] audit: type=1400 audit(1551975180.569:10): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-helper" pid=534 comm="apparmor_parser"

$ dhclient -v enp0s25
Internet Systems Consortium DHCP Client 4.3.3
Copyright 2004-2015 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/enp0s25/98:90:96:a5:d7:ae
Sending on   LPF/enp0s25/98:90:96:a5:d7:ae
Sending on   Socket/fallback
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 3 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 3 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 4 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 8 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 8 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 15 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 15 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 18 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 21 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 14 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 7 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 9 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 11 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 19 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 17 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 13 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 13 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 21 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 9 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 9 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 11 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 11 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 15 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 11 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 13 (xid=0xaa3dfb7d)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 3 (xid=0xaa3dfb7d)
No DHCPOFFERS received.
No working leases in persistent database – sleeping.

Это кажется нечетным, что вывод маршрута является пробелом и также что eth0 устройство отсутствует в интерфейсах. Как я могу подключиться?Спасибо!