I did hConfig again. Now blue light is solid and I am waiting as before, for device to connect and for Loading.
The plus on the right was not available. But this time, it did say Core2 was online.
Perhaps the problem is “Ublock Origin” that I run in my Firefox browser. This is in my Windows 10 desktop computer, and not the Ubuntu computer that I plan to use to do the programming. Excuse me for not stating that earlier. “Ublock” did say it has blocked one item on your web page.
Ah, we finally got it. Now web IDE is up. The plus never did appear. It said instead, “Edit.” But above was the IDE name in faint print. I clicked on that.
And the tiny LEDs are blinking, responding to key press and mouse click! Great!