Linux Mint 20 -- Losing Internet Connection

[Kanuto-49]

Noobie Windows-to-Linux transition user, running Linux Mint 20 on a wired network. I periodically am losing internet connection. It started after I did a 'sudo apt upgrade' (maybe I shouldn't have done this?) When I experience this problem, I have access to my local LAN OK. No problem with my modem/router since a reboot clears the problem. I can't figure out how to fix this; any help would be appreciated. TIA, Ken

[sleeper12]

Just to start, see if this helps any:

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 sudo service network-manager restart 

Might also help to post your system details:

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 inxi -Fxxxrz 

[Kanuto-49]

OK, I tried sudo service network-manager restart and it didn't fix the pronlem.

Here is the output from inxi -Fxxxrz

inxi -Fxxxrz
System:
Kernel: 5.4.0-80-generic x86_64 bits: 64 compiler: gcc v: 9.3.0
Desktop: Cinnamon 4.8.6 wm: muffin 4.8.1 dm: LightDM 1.30.0
Distro: Linux Mint 20.1 Ulyssa base: Ubuntu 20.04 focal
Machine:
Type: Desktop System: ASUS product: All Series v: N/A serial: <filter>
Mobo: ASUSTeK model: Z97-PRO GAMER v: Rev X.0x serial: <filter>
UEFI: American Megatrends v: 2107 date: 11/11/2015
CPU:
Topology: Quad Core model: Intel Core i7-4790 bits: 64 type: MT MCP arch: Haswell
rev: 3 L2 cache: 8192 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 57564
Speed: 899 MHz min/max: 800/4000 MHz Core speeds (MHz): 1: 901 2: 899 3: 900 4: 900
5: 900 6: 900 7: 902 8: 900
Graphics:
Device-1: NVIDIA GF108 [GeForce GT 730] vendor: Micro-Star MSI driver: nvidia
v: 390.143 bus ID: 02:00.0 chip ID: 10de:0f02
Display: x11 server: X.Org 1.20.9 driver: nvidia
unloaded: fbdev,modesetting,nouveau,vesa resolution: 1920x1080~60Hz
OpenGL: renderer: GeForce GT 730/PCIe/SSE2 v: 4.6.0 NVIDIA 390.143
direct render: Yes
Audio:
Device-1: Intel 9 Series Family HD Audio vendor: ASUSTeK driver: snd_hda_intel
v: kernel bus ID: 00:1b.0 chip ID: 8086:8ca0
Device-2: NVIDIA GF108 High Definition Audio vendor: Micro-Star MSI
driver: snd_hda_intel v: kernel bus ID: 02:00.1 chip ID: 10de:0bea
Sound Server: ALSA v: k5.4.0-80-generic
Network:
Device-1: Intel Ethernet I218-V vendor: ASUSTeK driver: e1000e v: 3.2.6-k port: f040
bus ID: 00:19.0 chip ID: 8086:15a1
IF: eno1 state: up speed: 1000 Mbps duplex: full mac: <filter>
Device-2: Broadcom and subsidiaries BCM4352 802.11ac Wireless Network Adapter
vendor: ASUSTeK driver: bcma-pci-bridge v: N/A port: e000 bus ID: 06:00.0
chip ID: 14e4:43b1
IF-ID-1: nordlynx state: unknown speed: 10 Mbps duplex: full mac: N/A
Drives:
Local Storage: total: 1.82 TiB used: 77.54 GiB (4.2%)
ID-1: /dev/sda vendor: Seagate model: ST2000DM001-1ER164 size: 1.82 TiB
speed: 6.0 Gb/s rotation: 7200 rpm serial: <filter> rev: HP51 temp: 30 C scheme: GPT
Partition:
ID-1: / size: 1.79 TiB used: 77.54 GiB (4.2%) fs: ext4 dev: /dev/sda2
Sensors:
System Temperatures: cpu: 29.8 C mobo: 27.8 C gpu: nvidia temp: 39 C
Fan Speeds (RPM): N/A gpu: nvidia fan: 42%
Repos:
No active apt repos in: /etc/apt/sources.list
Active apt repos in: /etc/apt/sources.list.d/google-earth-pro.list
1: deb [arch=amd64] http://dl.google.com/linux/earth/deb/ stable main
Active apt repos in: /etc/apt/sources.list.d/nordvpn.list
1: deb https://repo.nordvpn.com/deb/nordvpn/debian stable main
Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
1: deb http://packages.linuxmint.com ulyssa main upstream import backport #id:linuxmint_main
2: deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
3: deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
4: deb http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
6: deb http://archive.canonical.com/ubuntu/ focal partner
Info:
Processes: 262 Uptime: 24m Memory: 15.58 GiB used: 2.93 GiB (18.8%) Init: systemd
v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 9 Shell: bash v: 5.0.17
running in: gnome-terminal inxi: 3.0.38

[sleeper12]

Have you tried reinserting the ethernet cable, maybe into a different port if you have another? You can also try reloading the driver:

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 sudo modprobe -r e1000e && sudo modprobe e1000e 

[Kanuto-49]

I tried reinserting the cable with no fix, I don't think the cable is the problem since I can ping the router while I have the problem. I will reload the driver (which driver?), can you tell me how to do that? Thanks

[motoryzen]

Ok. terminal command time again:

post the results of at least 4 or 5 line results of ( without quotes) "ping www.google.com" or ping (insert whatever other site you prefer).com

Hold ctrl then press z to stop it, then highlight and copy, then paste the results suing that </> button just above the message window please.

Here's mine

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PING www.google.com (142.251.35.196) 56(84) bytes of data.
64 bytes from dfw25s46-in-f4.1e100.net (142.251.35.196): icmp_seq=1 ttl=108 time=35.9 ms
64 bytes from dfw25s46-in-f4.1e100.net (142.251.35.196): icmp_seq=2 ttl=108 time=35.3 ms
64 bytes from dfw25s46-in-f4.1e100.net (142.251.35.196): icmp_seq=3 ttl=108 time=35.7 ms
64 bytes from dfw25s46-in-f4.1e100.net (142.251.35.196): icmp_seq=4 ttl=108 time=35.8 ms
64 bytes from dfw25s46-in-f4.1e100.net (142.251.35.196): icmp_seq=5 ttl=108 time=35.5 ms
^Z
[1]+  Stopped                 ping www.google.com

also

IF-ID-1: nordlynx state: unknown speed: 10 Mbps duplex: full mac: N/A

.... has me curious

[sleeper12]

I tried reinserting the cable with no fix, I don't think the cable is the problem since I can ping the router while I have the problem. I will reload the driver (which driver?), can you tell me how to do that? Thanks

Just enter the command in my previous post into the Terminal to reload the driver.

[Kanuto-49]

PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.
64 bytes from 1.1.1.1: icmp_seq=1 ttl=60 time=33.1 ms
64 bytes from 1.1.1.1: icmp_seq=2 ttl=60 time=33.0 ms
64 bytes from 1.1.1.1: icmp_seq=3 ttl=60 time=33.5 ms
64 bytes from 1.1.1.1: icmp_seq=4 ttl=60 time=32.9 ms
64 bytes from 1.1.1.1: icmp_seq=5 ttl=60 time=33.0 ms
^Z
[2]+ Stopped ping 1.1.1.1

I don't know what is going on with nordlynx, my download speed is good.

[motoryzen]

Perhaps this next suggestion may seem silly, but have you tried disabling that nordlynx vpn service entirely and surfing the web without it for a reasonably..defined period of time to see if the problem doesn't happen again?

I'm not trying to blame the vpn here, but I believe in ruling out all suspects of a problem if at all possible.

Does this disconnection happen at specific events? Such as visiting certain sites or a certain time of the day? How long is the internet connection down for when it does happen?

[Kanuto-49]

Well, I disabled Nordlynx as you suggested and have been running 24 hours without the problem. I was experiencing the problem 4-5 times a day before. It looks like your suggestion wasn't so silly. There happens to be a later version of Nordlynx on the Nord website. I will uninstall the version I have and install the newer version and see if the problems happen again. Thanks to all for your help !!!!

[motoryzen]

Well, I disabled Nordlynx as you suggested and have been running 24 hours without the problem. I was experiencing the problem 4-5 times a day before. It looks like your suggestion wasn't so silly. There happens to be a later version of Nordlynx on the Nord website. I will uninstall the version I have and install the newer version and see if the problems happen again. Thanks to all for your help !!!!

*nods humbly* , *scratches chin curiously*

Have you tried other VPNs? (just in case you find this newer version ends with the same unfortunately problematic results)

I've had PIA before and never had any speed performance problems be it Windows, Mac, or multiple linux distros on my laptop ( dell inspiron with 5000 series broadwell cpu from late 2015), or my desktops ( 4790k build and my current 5900x cpu build)