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Wifi drops off after a little while with Ubuntu 20.04 server on Raspi

cn flag
pitosalas

This has been asked in various forms, and I've tried many approaches to no full avail. Here's my scenario. Raspi 3+ running Ubuntu 20.04 server.

I am folling these instructions: https://forum.dexterindustries.com/t/setup-python3-gopigo3-and-di-sensors-on-ubuntu-server-20-04-64-bit-for-non-root-access/8305:

// DOWNLOAD UBUNTU 20.04 Server LTS 64-bit image
https://ubuntu.com/download/raspberry-pi


//Flash SD card with Raspberry Pi Imager
  Select the Ubuntu->Ubuntu Server 20.04 LTS 64-bit
  or Custom->ubuntu-20.04.2-preinstalled-server-arm64_raspi.img.xz
  (Scroll) Select the 16GB SD Card

Which I believe has been used by others...THen:

Wired network works fine. Wireless network works fine but after a certain amount of time (minutes not hours) it just stops working. Here are a variety of data:

I enable wifi with this command (among others that I tried)

sudo nmcli d wifi connect myssid password thepassword

It works fine without a cable as well. But after a little while it stops working and when I try it again it says:

Error: No network with SSID 'myssid' found.

I know the network is still there, didn't go anywhere. If I reboot it works fine again.

nmcli by itself shows:

wlan0: disconnected
        "Broadcom BCM43438 combo and Bluetooth Low Energy"
        wifi (brcmfmac), B8:27:EB:F0:28:E7, hw, mtu 1500

eth0: unmanaged
        "Microchip 7800"
        ethernet (lan78xx), B8:27:EB:A5:7D:B2, hw, mtu 1500

lo: unmanaged
        "lo"
        loopback (unknown), 00:00:00:00:00:00, sw, mtu 65536

tailscale0: unmanaged
        "tailscale0"
        tun, sw, mtu 1280

p2p-dev-wlan0: unmanaged
        "p2p-dev-wlan0"
        wifi-p2p, hw

I don't knowwhere p2p-dev-wlan0 came from. I might have done it during trouble shooting. Not sure if it matters.

route gives

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         _gateway        0.0.0.0         UG    100    0        0 eth0
192.168.4.0     0.0.0.0         255.255.252.0   U     0      0        0 eth0
_gateway        0.0.0.0         255.255.255.255 UH    100    0        0 eth0

Question:

You see that I am building on a standard ubuntu Raspi image. Given the behavior I am seeing and the listing above, is there anything suspicious that you spot that could explain the problem?

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cn flag
pitosalas
Yes, that's what I am using. My comment became a mess because of formatting so I moved it to the main body of the question.
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Nmath avatar
ng flag
Nmath
I've never had to run any nmcli commands to get wifi working on a raspi. I've only ever used a wpa_supplicant.conf file for headless setup or the raspi-config command. You can search these options for more information on each. If the problem is the same after a fresh flash using one or both of those options, I would assume that the problem is with your network or the raspi needs to be relocated to avoid physical or electromagnetic interference
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cn flag
pitosalas
Thanks! Do you recognize: "p2p-dev-wlan0: unmanaged" and is it normal?
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Nmath avatar
ng flag
Nmath
raspi-config doesn't seem to be included in 20.04 so I would try wpa_supplicant: https://raspberrypi.stackexchange.com/a/57023
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