LM 20.1 no network connection except through phone tether

[Cyclists All Around]

Hello everyone,
I'm sorry to bother you with a common issue: I cannot connect to the internet except through phone tethering (Y! Mobile in Japan). Through my phone I have downloaded drivers and updates. I'm using Linux only, no Windows OS.
I've tried to connect through ethernet and wifi, networks that work with all other devices in house. I've unplugged and replugged them many times in the past week. I've tried to type the router numbers in, but I haven't made progress.
My motherboard is ASRock B550 Steel Legend.
Other advisors on this forum have asked for the following info via the command inxi -Fxxxrz:

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System:
  Kernel: 5.4.0-71-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 Mobo: ASRock model: B550 Steel Legend serial: <filter> 
  UEFI: American Megatrends v: P1.90 date: 02/24/2021 
CPU:
  Topology: 12-Core model: AMD Ryzen 9 3900 bits: 64 type: MT MCP arch: Zen 
  L2 cache: 6144 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm 
  bogomips: 148517 
  Speed: 2201 MHz min/max: 2200/3100 MHz boost: enabled Core speeds (MHz): 
  1: 2191 2: 2200 3: 2197 4: 2196 5: 2179 6: 2190 7: 2194 8: 2191 9: 2200 
  10: 2189 11: 2196 12: 2195 13: 2205 14: 2193 15: 2194 16: 2195 17: 2190 
  18: 2196 19: 2196 20: 2206 21: 2195 22: 2196 23: 2205 24: 2194 
Graphics:
  Device-1: NVIDIA driver: nvidia v: 460.56 bus ID: 05:00.0 
  chip ID: 10de:2486 
  Display: x11 server: X.Org 1.20.9 driver: nvidia 
  unloaded: fbdev,modesetting,nouveau,vesa resolution: 1920x1080~60Hz 
  OpenGL: renderer: GeForce RTX 3060 Ti/PCIe/SSE2 v: 4.6.0 NVIDIA 460.56 
  direct render: Yes 
Audio:
  Device-1: NVIDIA driver: snd_hda_intel v: kernel bus ID: 05:00.1 
  chip ID: 10de:228b 
  Device-2: AMD Starship/Matisse HD Audio vendor: ASRock 
  driver: snd_hda_intel v: kernel bus ID: 07:00.4 chip ID: 1022:1487 
  Sound Server: ALSA v: k5.4.0-71-generic 
Network:
  Device-1: Realtek RTL8125 2.5GbE vendor: ASRock driver: N/A port: f000 
  bus ID: 04:00.0 chip ID: 10ec:8125 
  IF-ID-1: usb0 state: unknown speed: N/A duplex: N/A mac: <filter> 
Drives:
  Local Storage: total: 5.91 TiB used: 17.99 GiB (0.3%) 
  ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 980 PRO 500GB 
  size: 465.76 GiB speed: 63.2 Gb/s lanes: 4 serial: <filter> rev: 1B2QGXA7 
  scheme: GPT 
  ID-2: /dev/sda vendor: Seagate model: ST6000DM003-2CY186 size: 5.46 TiB 
  speed: 6.0 Gb/s rotation: 5425 rpm serial: <filter> rev: 0001 
Partition:
  ID-1: / size: 456.96 GiB used: 17.98 GiB (3.9%) fs: ext4 
  dev: /dev/nvme0n1p2 
Sensors:
  System Temperatures: cpu: 25.1 C mobo: N/A gpu: nvidia temp: 28 C 
  Fan Speeds (RPM): N/A gpu: nvidia fan: 0% 
Repos:
  No active apt repos in: /etc/apt/sources.list 
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
  1: deb http://ftp.jaist.ac.jp/pub/Linux/linuxmint/packages ulyssa main upstream import backport
  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: 385 Uptime: 27m Memory: 62.74 GiB used: 1.80 GiB (2.9%) 
  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 
platypen@Platypus-Penguin:~$ ^C

I have to admit, the above means little to me now, but I want to learn. Please help me become part of your community. I want independence in my computer life.

Yours truly,
Platypus-Penguin

[sleeper12]

Post the results of:

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 lspci && rfkill list && iwconfig && mokutil --sb-state 

[Cyclists All Around]

Thank you for replying. I hope the following is helpful (I'm completely new to all of this).

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platypen@Platypus-Penguin:~$  lspci && rfkill list && iwconfig && mokutil --sb-state 
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Root Complex
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge
00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
00:03.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge
00:04.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
00:05.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
00:07.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
00:07.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B]
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B]
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 61)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 7
01:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd Device a80a
02:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Device 43ee
02:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] Device 43eb
02:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43e9
03:08.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43ea
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 05)
05:00.0 VGA compatible controller: NVIDIA Corporation Device 2486 (rev a1)
05:00.1 Audio device: NVIDIA Corporation Device 228b (rev a1)
06:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Function
07:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Reserved SPP
07:00.1 Encryption controller: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Cryptographic Coprocessor PSPCPP
07:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Matisse USB 3.0 Host Controller
07:00.4 Audio device: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller
lo        no wireless extensions.

usb0      no wireless extensions.

[sleeper12]

Does this show any results at all:

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 mokutil --sb-state 

[Cyclists All Around]

No, I entered what you wrote, but what I got back was

platypen@Platypus-Penguin:~$ mokutil --sb-state
SecureBoot disabled
Platform is in Setup Mode
platypen@Platypus-Penguin:~$ ^C
platypen@Platypus-Penguin:~$

which I cannot make any sense of

[sleeper12]

Ok, secure boot is disabled as it should be. Let's see:

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 rfkill list all 

[Cyclists All Around]

I'm sorry, I put that command in the box, but got nothing in return. Just. Nothing. A new line

[sleeper12]

Ok, I'm not sure what best to do here. I see no mention of a wifi card present & you have no ethernet driver. You could probably try the 5.8 kernel on that newer machine, but I don't know if it would solve anything or not. Wait for someone who can give you better help.

[Cyclists All Around]

I see, thank you so much for considering my situation.
My kernel is 5.4, but I have had the same network connection issues since I got my system booted about 2 weeks ago.
I don't know if it's a faulty MB, or if I've made a silly mistake, or if Japanese internet is a problem...
Like I said, with mobile phone tethering, I can connect to internet smoothly, but direct ethernet connection doesn't work, and wifi doesn't connect either.
I'll go to Tsukumo Electronics on Sunday with my whole set up if I can't get through this--my 1-month warrantee is going to wear out!

[sleeper12]

Might as well try the 5.8 kernel in Update Manager, View, Linux kernels. It will either help or not.

[Cyclists All Around]

Thank you, I tried Update Manager, but I was told I was up to date. I'm not sure how to press M. Manager for more info...

[sleeper12]

In Update Manager, there's a tab on top that says View. Click that, then Linux kernels & install the highest 5.8 kernel & reboot.

[Cyclists All Around]

Thank you for your patience with me. Okay, I've installed and run the kernel 5.8.0-50, but unfortunately no change in internet status. Can only connect with tethering.
I've tried manually entering my SSID from the router, both wired and wireless. I've tried both with and without colons between bigrams. I don't know what a BSSID is, so I've left it blank and put in the MAC address. I'm just. confused.

[sleeper12]

I suspect that machine might be too new for Mint. It could be that the 5.9 kernel might get things going, but it isn't readily available in Mint as yet. If you want to try installing it anyway, see here:
https://www.askmetutorials.com/2020/10/ ... buntu.html