Thanks to Angus and Rudi for all the good information. I seem to have gotten it working consistently on a few tries.

BTW, I am using a Windows 10 host with an Ubuntu 16.10 guest, plus the latest VirtualBox, extensions and guest additions.

First, since I suspected a conflict with USBPcap as ...

So close and yet so far...

Not surprisingly, trying to run make flash after this results in...

I'm going to step away from this for a little bit...

Don

Well, I built a new Ubuntu 16.10 VM from scratch and still no joy. Even confirmed that CP210x support was already present.

By searching the text of the above error message, I found this forum post and, when I applied the listed fixes, got rid of the error. The Windows host registry did list a ...

I tried installing the driver because it wasn't working initially, so I don't think that could be the original cause of the problem but it certainly could have complicated it further.

Here's another error I received that implies, to me, that VB is trying to pass the device to Ubuntu but that it is ...

Hello, all. First post.

I am trying to get an Ubuntu VM running in VirtualBox to devote to ESP32 development. The ESP-IDF tool chain installed nicely and I was able to edit and compile the sample project, but I cannot flash it to the dev board because the on-board Silabs USB-serial adapter never ...