Hello Paul, On Sun, Apr 18, 2021 at 12:20 PM sciguy via talk <talk@gtalug.org> 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?
Paul
What does it show when you type /sbin/ifconfig -a in a terminal ? aruna@debian:~$ /sbin/ifconfig -a eth0 Link encap:Ethernet HWaddr d8:50:e6:53:0d:90 inet addr:192.168.2.124 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: xxxx::xxxx:xxxx:xxxx:d90/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2871734 errors:0 dropped:0 overruns:0 frame:0 TX packets:1934374 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3777418026 (3.5 GiB) TX bytes:187326708 (178.6 MiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:2593 errors:0 dropped:0 overruns:0 frame:0 TX packets:2593 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:170133 (166.1 KiB) TX bytes:170133 (166.1 KiB) And what does ip link show ? aruna@debian:~$ ip link 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff If you see LOWER_UP your interface is up. you can try : aruna@debian:~$ sudo /sbin/ifconfig eth0 up and change the interface to match your own. If you are using iptables sometimes that can mess up the internet connection, very rare but has happened to me when I was initially learning and experimenting with iptables :-) Hope this helps - Aruna