To recap, I have had problems with connecting my computer to the
immediate network (let alone the internet). It is dual-boot, and Windows
10 connects perfectly. Same hardware.
I have recently had time to examine /var/log/syslog, and I have made a
pastebin of just the messages from NetworkManager.
https://pastebin.com/CbfnANpU
Here are some key lines that got my attention:
Apr 30 09:32:43 rivendell NetworkManager[2015]: <info>
[1619789563.0888] device (lo): carrier: link connected
Apr 30 09:32:43 rivendell NetworkManager[2015]: <info>
[1619789563.0890] manager: (lo): new Generic device
(/org/freedesktop/NetworkManager/Devices/1)
Apr 30 09:32:43 rivendell NetworkManager[2015]: <info>
[1619789563.0896] manager: (eno1): new Ethernet device
(/org/freedesktop/NetworkManager/Devices/2)
Apr 30 09:32:43 rivendell NetworkManager[2015]: <info>
[1619789563.5762] settings: (eno1): created default wired connection
'Wired connection 1'
Apr 30 09:32:43 rivendell NetworkManager[2015]: <info>
[1619789563.6633] device (eno1): state change: unmanaged -> unavailable
(reason 'managed', sys-iface-state: 'external')
Apr 30 09:32:43 rivendell NetworkManager[2015]: <warn>
[1619789563.9481] Error: failed to open /run/network/ifstate
It then tries again several times. If I interpret this correctly, tt
seems to make a connecion, then by the fifth message there is a "state
change" to "unmanaged". Any ideas as to what would cause this?
Paul
On 2021-04-18 16:57, sciguy wrote:
Thanks a lot, Dave!
Paul
On 2021-04-18 12:47, David Collier-Brown via talk wrote:
On 2021-04-18 12:20 p.m., sciguy via talk wrote:
I have a desktop computer that dual boots into Ubuntu Studio and
Windows 10. It is connected to the internet using a cat-5 cable to my
router.
After the last update and rebooting, it turns out that I no longer
have ethernet on Linux. This is not true on Windows, as I am writing
you this email from the same computer.
I strongly suspect that there is an update issue that is disabling
ethernet on Linux. Right now, my computer is in splendid isolation
from the rest of the world. I can't even see computer resources from
other computers in my apartment. I also can't see the router itself
through my browser.
Any ideas as to what to do next to diagnose the problem?
I'd start with the network manger GUI, see if you can see anything
obvious there, and if not, start debugging from the command-line.
In a previous life, I found the instructions for disabling network
manager contained a lot of useful information.
If you take that route, use script(1) and a notepad to carefully
record your steps, as a lot of networking stuff is sensitive to the
order you do things in, and you want to make a good map of where you
went, for the time when you want to undo the changes you made.
Oh, and make a backup of your home directory if you haven't already
--dave
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