I had this very same issue when upgrading a Pi 2 image of Ubuntu Server 16.04.3 to Pi 3. The directions are here: https://wiki.ubuntu.com/ARM/RaspberryPi#line-105
The work-around in comment #4 worked well and is very much appreciated.
I had this very same issue when upgrading a Pi 2 image of Ubuntu Server 16.04.3 to Pi 3. The directions are here: https:/ /wiki.ubuntu. com/ARM/ RaspberryPi# line-105
The work-around in comment #4 worked well and is very much appreciated.