我已经在网上搜索过这个问题了。似乎很多人都遇到了这个问题，但不幸的是，这些解决方案似乎对我都不起作用。
我最近的是这个一，我已经重新安装了 NIC 驱动程序。
我也尝试将我的卡添加到文件中/etc/network/interfaces以避免 NetworkManager 使用它，但结果是一样的：无休止的DHCP Discover消息而没有OFFER回应。
Sep 2 14:25:21 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 12 (xid=0xc5f73c43)
Sep 2 14:25:22 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 19 (xid=0xa5e64914)
Sep 2 14:25:33 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 12 (xid=0xc5f73c43)
Sep 2 14:25:41 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 11 (xid=0xa5e64914)
Sep 2 14:25:45 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 21 (xid=0xc5f73c43)
Sep 2 14:25:52 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 20 (xid=0xa5e64914)
Sep 2 14:26:06 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 17 (xid=0xc5f73c43)
Sep 2 14:26:12 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 9 (xid=0xa5e64914)
Sep 2 14:26:21 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 14 (xid=0xa5e64914)
Sep 2 14:26:23 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 16 (xid=0xc5f73c43)
Sep 2 14:26:35 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 16 (xid=0xa5e64914)
Sep 2 14:26:39 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 10 (xid=0xc5f73c43)
Sep 2 14:26:49 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 12 (xid=0xc5f73c43)
Sep 2 14:26:51 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 8 (xid=0xa5e64914)
Sep 2 14:26:59 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 12 (xid=0xa5e64914)
Sep 2 14:27:01 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 7 (xid=0xc5f73c43)
Sep 2 14:27:08 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 9 (xid=0xc5f73c43)
Sep 2 14:27:11 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 15 (xid=0xa5e64914)
Sep 2 14:27:17 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 14 (xid=0xc5f73c43)
Sep 2 14:27:26 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 19 (xid=0xa5e64914)
Sep 2 14:27:31 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 7 (xid=0xc5f73c43)
Sep 2 14:27:38 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 8 (xid=0xc5f73c43)
Sep 2 14:27:45 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 21 (xid=0xa5e64914)
Sep 2 14:27:46 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 9 (xid=0xc5f73c43)
Sep 2 14:27:55 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 7 (xid=0xc5f73c43)
Sep 2 14:28:02 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 12 (xid=0xc5f73c43)
Sep 2 14:28:06 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 18 (xid=0xa5e64914)
Sep 2 14:28:14 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 17 (xid=0xc5f73c43)
Sep 2 14:28:24 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 20 (xid=0xa5e64914)
我已经尝试在交换机端口上使用另一台 PC，并且它获取了 IPv4 地址，因此交换机和 DCHP 服务器都没有故障。
另外，我的 wifi 卡已连接到 AP。
这是我的系统：
lucas@lucas-HP-240-G6-Notebook-PC:~$ uname -a
Linux lucas-HP-240-G6-Notebook-PC 4.4.0-161-generic #189-Ubuntu SMP Tue Aug 27 08:10:16 UTC 2019 x86_64 x86_64 x86_64 GNU/Li
lucas@lucas-HP-240-G6-Notebook-PC:~$ lshw -c network
WARNING: you should run this program as super-user.
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: eno1
version: 15
serial: f4:30:b9:9e:5f:73
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.046.00-NAPI duplex=full latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:126 ioport:4000(size=256) memory:b1104000-b1104fff memory:b1100000-b1103fff
*-network
description: Wireless interface
product: Realtek Semiconductor Co., Ltd.
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlo1
version: 00
serial: 40:9f:38:22:15:ef
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtl8723de ip=10.10.39.74 latency=0 multicast=yes wireless=IEEE 802.11bgn
resources: irq:131 ioport:3000(size=256) memory:b1000000-b100ffff
*-network DISABLED
description: Ethernet interface
physical id: 1
logical name: virbr0-nic
serial: 52:54:00:da:ff:85
size: 10Mbit/s
capabilities: ethernet physical
configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full link=no multicast=yes port=twisted pair speed=10Mbit/s
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.
lucas@lucas-HP-240-G6-Notebook-PC:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
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: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether f4:30:b9:9e:5f:73 brd ff:ff:ff:ff:ff:ff
inet 169.254.8.56/16 brd 169.254.255.255 scope link eno1:avahi
valid_lft forever preferred_lft forever
inet6 fe80::8ae2:b747:3347:da25/64 scope link
valid_lft forever preferred_lft forever
3: wlo1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 40:9f:38:22:15:ef brd ff:ff:ff:ff:ff:ff
inet 10.10.39.74/22 brd 10.10.39.255 scope global dynamic wlo1
valid_lft 13766sec preferred_lft 13766sec
inet6 fe80::cfdf:3c42:b81f:1af6/64 scope link
valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether 52:54:00:da:ff:85 brd ff:ff:ff:ff:ff:ff
/etc/network/interfaces这是...的内容
lucas@lucas-HP-240-G6-Notebook-PC:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
auto eno1
iface eno1 inet dhcp
有什么提示吗？
谢谢！