On Tue, 3 Nov 2020, Michael Hennebry wrote:

I tried to boot a Centos 8.2 install CD,
one burned with Centos-8-2-2004-x86_64-boot .

In the setup, it persisted in telling me
that ethernet thing enp0s25 was disconnected.
Nyet.
'Twas working several seconds previous and is working now.
This is a showstopper.
How do I debug it?

I had the same thing happen in a VM. My interface was ens192, and this worked:

# ==== %< ====
# get status of all network devices
nmcli device status

# look at all the settings for ens192
nmcli connection show ens192

# enable ens192 at boot time
nmcli connection modify ens192 connection.autoconnect yes

# start ens192 immediately
nmcli connection up ens192
# ===== %< ====

Hope that helps.

--
Paul Heinlein
heinl...@madboa.com
45°38' N, 122°6' W
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