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The offending device is the Realtek RTL8125 series. In my case, it is on an ASRock B550 Steel Legend motherboard.
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"Ubuntu 21.04 wird der RTL8125 nativ vom Kernel 5.10.x unterstützt."
In this version of French that is not used too much in Canada , it tells us that the Ubuntu 21.04 supports natively the chip and if you don't have special reasons for to install another Ubuntu version, I would go with this one, making the updates a bit easier.
Also kernel series 5.10 is ancient, I'm always amazed why the desktop distributions are not a bit more agile with the kernel and libraries, but this a whole other can of bird seeds.
Cheers,
DC1MC
It does support it ... now. We need to be a bit more specific in our version numbers.
I realized that I mixed up my ISO files and had created yet another copy of Ubuntu 20.04.
1 on my USB stick.
So I went back and re-did my USB stick with Ubuntu 20.04.
3.
This time the computer could boot from the USB stick with Ethernet. Yay!
Right, or so I hoped?
Choose to install, carefully selecting to replace Ubuntu 20.04.
1 with Ubuntu 20.04.
3, and leaving other partitions alone.
On installation, there was an error installing the GRUB package. Uh oh, this is an important one
Yep, there is no more bootable partition on the drive
Unfortunately, it is time to pack up this computer, and what little space remains for my bench.
It is Monday, and now the work computer gets unpacked and takes over the space.
Future project: wipe the SSD and start over with Win 10 (for SWMBO) dual-boot with Ubuntu 20.04.
3 (for the 8 year old)...