I checked
/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf. The link you mentioned was the only line in the file.
I commented out the line. It now reads [keyfile]
#unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma
I ran systemctl reload NetworkManager and shut down. I booted the machine again, no network. I ran ifconfig and it didn't even shoe the network adapter.
delboy@ladmo:~$ ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 1289 bytes 103269 (103.2 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1289 bytes 103269 (103.2 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
After I rebooted, the network was back and ifconfig showed lo and the ethernet adapter.
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet
192.168.1.2 netmask 255.255.255.0 broadcast 192.168.1.255 inet6
fe80::1480:79c7:4830:8495 prefixlen 64 scopeid 0x20<link>
ether 34:17:eb:d0:34:55 txqueuelen 1000 (Ethernet) RX
packets 1528 bytes 618600 (618.6 KB) RX errors 0 dropped 0
overruns 0 frame 0 TX packets 1453 bytes 198021 (198.0 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 20 memory 0xf7200000-f7220000
On 9/23/22 13:57, Joseph Sinclair via PLUG-discuss wrote:
> I've discovered a similar issue just yesterday. I hunted it down and found that the cause, for me at least, was in the static NetworkManager configuration.
> NetworkManager configuration now marks *all* interfaces as unmanaged *except* WiFi and Cellular, basically all non-wireless interfaces are prevented from being activated. Apparently some genius at Ubuntu decided nobody uses wired connections.
> In /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf, check the line that starts with "unmanaged-devices". If it reads as follows, consider modifying or commenting out the line.
> unmanaged-devices=*,except=type:wifi,except=type:gsm,except=type:cdma
>
> If you make changes, run "systemctl reload NetworkManager" to update the running daemon.
>
>
> On 2022-09-23 12:04 PM, T Zack Crawford via PLUG-discuss wrote:
>> I am very interested in the answer because my desktop does the same thing if I tell it to hibernate, boot into my windows dual boot, and reboot back into linux. I can regain network access again by hibernating again and booting back into linux directly (no windows). Pretty annoying because it takes a solid 2-5 minutes to shut down when hibernating. At least it still does the job, just with delay.
>>
>> This only happens if I try hibernating and then boot into windows (not full shutdown, not hibernate and boot directly to linux). It has always happened since I enabled hibernation (arch wiki instructions). Having Systemd restart NetworkManager does nothing. Setting up a new network configuration with networkmanager does not solve it. This is with my motherboard ethernet and my wireless USB adapter. I spent some good energy trying to figure it out, but never did.
>>
>>
>> Did you update kernels today? What if you downgrade?
>>
>> Put the solution as a boot script. Or at least bash profile instead of run commands (otherwise it will run every time you spawn a terminal shell)
>>
>> Sep 23, 2022 11:14:35 Jim via PLUG-discuss<plug-discuss@lists.phxlinux.org>:
>>
>>> A few months ago my Dell Optiplex 7010 running Ubuntu 20.04 started booting up without the network. I'd reboot the machine and the network was there. If I shut down the machine and turned it on again, no network. I thought something was wrong with the built in ethernet adapter, so I bought a usb adapter, disabled the built in one and the problem went away until today. Now it's happening with the usb ethernet adapter. Rebooting the machine fixes the problem gets the network up and running. If I start with a cold boot and reboot at the grub screen, I get the network. I have 3 SSDs and 2 HDDs. I have the same video card that I had before this problem first showed itself. It's a GeForce GT 710.
>>>
>>> I looked online and found something telling of other people who have had this problem. They disconnected video cards and went back to the built in video (display port), and removed hard drives that had been added later and this fixed the problem. The ultimate solution was to replace the power supply. I disconnected one SSD and the 2 HDDs. I don't have anything that can use a display port, so I left the video card in place. All I had connected were 2 SSDs. One it boots from and my home directory is on the other. The problem still showed itself when I booted the machine, so I shut down and plugged in everything again. This thing has a 240 watt power supply. Do power supplies go band in such a way they don't produce the amount of power they used to?
>>>
>>> Any ideas what it might be? Is there a command that would tell the system to set up the network again? If there is, I could put it in the .bashrc until I get this fixed.
>>>
>>> Thanks
>>>
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