Thanks, installing the DHCP server did the trick.

After many years of successful operation I upgraded both of my units (HDHR Prime 1323BF1D and 131F9021) to the latest firmware version for Linux (20200907?). After the upgrade both units ceased operating, as far as I can tell completely, with no detectable output. The leftmost LED on each HDHR Prime...

Problem solved. Evidently there was something corrupted that was resolved by reinstalling everything including OS (revert to Xubuntu 18.04). I suspect a memory failure so I replaced one of the memory modules. So far that seems to have resolved the problem (knock on wood).

HDHomerun Config still crashes immediately upon startup. I've tried everything I can think of even to the point of completely erasing the system drive and reinstalling everything, including the OS (Ubuntu 20.04) from scratch.
Any and all suggestions welcome.

The HDHomeruns are plugged directly into PC LAN ports on the motherboard so I doubt the network path has been saturated.
It never gets to playing a channel. Any attempt to watch TV produces the all tuners are busy error.

Can someone please help? I've tried everything I know (not very much) and have gotten nowhere.

I neglected to mention in my first post: The system is running Ubuntu 20.04 on AMD FX-8350.

I attempt to launch HDHomerun Config and it starts perfectly. However, after a couple of seconds I get the message: ERROR: communication error. At that point that window no longer functions. It will not accept keyboard or mouse input and the error message cannot be removed from the display short of ...

After I create the file 'unofficial-hdhomerun-dvr-repo.list' in /etc/apt/sources.list.d containing 'deb https://unofficial-hdhomerun-dvr-repo.s3.us-east-1.amazonaws.com/deb stable non-free' and run sudo apt-get update, I see this: E: The repository 'https://unofficial-hdhomerun-dvr-repo.s3.us-east-1...