I just flashed my bq with a fresh image (rc-proposed 254), and reproduced this exact issue.
Then I installed unity8 from: https://code.launchpad.net/~unity-api-team/+archive/ubuntu/dev-build-1 (which is a build of: lp:~nick-dedekind/unity8/1534541.zombie-session)
I rebooted, ran through the exact same process and it didn't freeze.
I just flashed my bq with a fresh image (rc-proposed 254), and reproduced this exact issue.
Then I installed unity8 from: https:/ /code.launchpad .net/~unity- api-team/ +archive/ ubuntu/ dev-build- 1
(which is a build of: lp:~nick-dedekind/unity8/1534541.zombie-session)
I rebooted, ran through the exact same process and it didn't freeze.