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