Unable to ssh to RPi3 after initial configuration of Ubuntu Core

[George Gundry]

I followed the instructions here:
<https://developer.ubuntu.com/core/get-started/raspberry-pi-2-3>
https://developer.ubuntu.com/core/get-started/raspberry-pi-2-3

I have created a Ubuntu SSO account

uploaded my SSH public key,

used Win32DiskImager to burn the Ubuntu Core Pi3 image
ubuntu-core-16-pi3.img to an SD card,

booted the Pi3 connected to Ethernet,

correctly get the "Press Enter to Configure" message,

pass Network Config,

entered my SSO account,

got the "Contacting Store" message,

got the success reply back from the store saying the key had been stored on
the Pi and I can use ssh <username>@<ip address>

Try to connect to pi over ssh as instructed, private key auth fails .

Things I have tried:

Different terminal emulators - putty; Remote Terminal; TokenShell/MD;
command line ssh from another Pi; forcing use of specific private key with
-I option

Different SSH key pairs - known good pair that we use elsewhere; new keygen
generated keys with passphrase; new keygen generated keys without passphrase

Different Pi's - Work and home

Different Ubuntu SSO accounts - created a new account from scratch, same
result.

In desperation, I tried to load 16.04 LTS, and this was successful so I am
confident the kit (Pi, SD card, network connection) is good.

Nothing I have tried makes any difference, the private key is never accepted
by the Ubuntu Core device.

I am keen to investigate migrating our IoT product from Raspbian Lite to
Core, but can't seem to get beyond step one !

 

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