[GTALUG] Solved(?): No internet under Ubuntu 22.04 after booting into Windows 10

[sciguy]

Well, rather than just simply power cycling the computer as I had done, 
I instead shut down the comptuer from Windows, then pulled the plug for 
20-30 seconds. Then I re-inserted the plug and powered up. I am now 
writing this email from Linux.

A power-down doesn't really cut the juice to the motherboard. Some 
lights inside the box will remain on, and I recall that the NIC is 
resident on the motherboard.

-------- Original Message --------
As stated, I have a desktop PC that is dual-boot, and where the network 
operates under Windows 10 but not Linux.

I have been referred to this mailing list from Ubuntu Studio, since this 
appears to be a more general kind of problem.

I followed some suggestions given by previous responders in other lists, 
regarding net commands to help diagnose the system.

It was of some interest that I found that my router is assigning a 
different IP to the Windows 10 hostname than for the Linux hostname. 
However, the listing below doesn't really show any IP.

The commands run were:
ip addr show
ip link show
dhclient -r eno1
sudo dhclient -v eno1

The typescript is below:

Script started on 2022-12-17 17:03:12-05:00
$ ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
group default qlen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
     inet 127.0.0.1/8 scope host lo
        valid_lft forever preferred_lft forever
     inet6 ::1/128 scope host
        valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state 
UP group default qlen 1000
     link/ether d8:50:e6:4d:0c:da brd ff:ff:ff:ff:ff:ff
     altname enp0s25
     inet6 fe80::e8e4:6dba:23d6:c035/64 scope link noprefixroute
        valid_lft forever preferred_lft forever
$ ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode 
DEFAULT group default qlen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state 
UP mode DEFAULT group default qlen 1000
     link/ether d8:50:e6:4d:0c:da brd ff:ff:ff:ff:ff:ff
     altname enp0s25
$ dhclient -r eno1
$ sudo dhclient -v eno1
[sudo] password for paul:
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eno1/d8:50:e6:4d:0c:da
Sending on   LPF/eno1/d8:50:e6:4d:0c:da
Sending on   Socket/fallback
DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 3 
(xid=0x3a1ec029)
DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 5 
(xid=0x3a1ec029)
DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 11 
(xid=0x3a1ec029)
DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 18 
(xid=0x3a1ec029)
DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 13 
(xid=0x3a1ec029)
^C
$ exit

Script done on 2022-12-17 17:04:57-05:00 [COMMAND_EXIT_CODE="130"]

Thanks to anyone who can help or provide useful insight.

Paul King