Ok, something different to report:
In an experimental mood, I re-configured the drives:
Primary master: WD 40GB
Primary slave: DVD-ROM
Secondary master: WD 13GB
Secondary slave: WD 13 GB
I booted into the live 4.3 system from USB stick, selected the Troubleshooting>Basic Graphics mode, selected Install from the launch menu…
…and it completed without a problem!
Atached is the Calamares installation log file located at:
/root/cache/calamares/session.log
(I had to add the .txt extension so I could upload it here.)
session.log.txt (387 Bytes)
It is very brief, only five lines long.
At any rate, the system installation completed without incident (according to the Calamares GUI, anyway) and boots as expected, minus a few graphics glitches, but I will continue to attempt to resolve those.
Maybe now is the time to post the bug report.
Thanks again guys, for all your help with this.
TTYL
Mike