wifi 或以太网已连接但互联网断线的问题最近才出现，似乎是在重启后发生的，然后，不知何故，经过一段时间（几小时）后，它又开始工作了。此机箱是 Dell Precision T1700，带 16GB 内存。在同一 wifi 网络上的所有其他设备（MS Win、Apple Mac、Android 和 iPhone）上互联网均正常。
屏幕右上角的 wifi 或有线图标上有一个“？”。拔下/重新连接网关单元 -> 没有变化。有什么建议吗？
以下是一些硬件信息：
PCI Devices:
sudo lspci -nn
00:00.0 Host bridge [0600]: Intel 4th Gen Core Processor DRAM Controller [8086:0c00] (rev 06)
00:01.0 PCI bridge [0604]: Intel Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller [8086:0c01] (rev 06)
00:02.0 VGA compatible controller [0300]: Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06)
00:03.0 Audio device [0403]: Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller [8086:0c0c] (rev 06)
00:14.0 USB controller [0c03]: Intel 8 Series/C220 Series Chipset Family USB xHCI [8086:8c31] (rev 04)
00:16.0 Communication controller [0780]: Intel 8 Series/C220 Series Chipset Family MEI Controller #1 [8086:8c3a] (rev 04)
00:16.3 Serial controller [0700]: Intel 8 Series/C220 Series Chipset Family KT Controller [8086:8c3d] (rev 04)
00:19.0 Ethernet controller [0200]: Intel Ethernet Connection I217-LM [8086:153a] (rev 04)
00:1a.0 USB controller [0c03]: Intel 8 Series/C220 Series Chipset Family USB EHCI #2 [8086:8c2d] (rev 04)
00:1b.0 Audio device [0403]: Intel 8 Series/C220 Series Chipset High Definition Audio Controller [8086:8c20] (rev 04)
00:1c.0 PCI bridge [0604]: Intel 8 Series/C220 Series Chipset Family PCI Express Root Port #1 [8086:8c10] (rev d4)
00:1c.4 PCI bridge [0604]: Intel 8 Series/C220 Series Chipset Family PCI Express Root Port #5 [8086:8c18] (rev d4)
00:1d.0 USB controller [0c03]: Intel 8 Series/C220 Series Chipset Family USB EHCI #1 [8086:8c26] (rev 04)
00:1f.0 ISA bridge [0601]: Intel C226 Series Chipset Family Server Advanced SKU LPC Controller [8086:8c56] (rev 04)
00:1f.2 RAID bus controller [0104]: Intel SATA Controller [RAID mode] [8086:2822] (rev 04)
00:1f.3 SMBus [0c05]: Intel 8 Series/C220 Series Chipset Family SMBus Controller [8086:8c22] (rev 04)
01:00.0 VGA compatible controller [0300]:[AMD/ATI] Cape Verde GL [FirePro W4100] [1002:682c]
01:00.1 Audio device [0403]: [AMD/ATI] Oland/Hainan/Cape Verde/Pitcairn HDMI Audio [Radeon HD 7000 Series] [1002:aab0]
连接的 USB 设备：
sudo lsusb
Bus 002 Device 004: ID 0846:9053 NetGear, Inc. A6210
Bus 002 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver ← External Wifi reciever
Bus 002 Device 002: ID 8087:8000 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0781:5150 SanDisk Corp. SDCZ2 Cruzer Mini Flash Drive (thin)
Bus 001 Device 002: ID 8087:8008 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 002: ID 0781:5581 SanDisk Corp. Ultra
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
网卡：
sudo lshw -class 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: eno1
version: 04
serial: 64:00:6a:6f:ef:bf
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=5.15.0-58-generic firmware=0.13-4 latency=0 link=no multicast=yes port=twisted pair
resources: irq:29 memory:f7d00000-f7d1ffff memory:f7d3d000-f7d3dfff ioport:f080(size=32)
*-network
description: Wireless interface
physical id: 5
bus info: usb@2:1.5
logical name: wlx3c37861ae5b6
serial: 3c:37:86:1a:e5:b6
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=mt76x2u driverversion=5.15.0-58-generic firmware=0.0.00-b1 ip=192.168.12.230 link=yes multicast=yes wireless=IEEE 802.11
<-- Orig.--
-- Edited -->
Upon request by @chili555, the following ping & ls command results have been added...
1st - ping -c3 8.8.8.8, 2nd - ping -c3 www.ubuntu.com, 3rd - ls -al /etc/resolv.conf. Also, the wifi is currently functioning.
[1]: https://i.stack.imgur.com/esl8R.png
Note: The ping results shown were performed after the Internet started working. When connected with the Internet not working the ping on www.ubuntu.com fails.