I have two things on my mind before feeling comfortable enough to give the upgrade a try. My apologies for being overly careful but that N5 is my precious daily driver.

1) Could you please list the repositories that had been enabled before you tried the upgrade?

2) Someone mentioned elsewhere there might be problems finding GPS positions when using 3.0.1.14. Would it be possible for you to test this?

Again, kudos runwithcow, kudos mautz and kudos to everyone else involved in this wonderful project.

P.S. Maybe an interesting finding: The UBports folks seem to experience the same bluetooth car audio problem that has been bugging me/us. They actually filed two bug reports (which I reckon must be the same problem):

https://github.com/ubports/ubuntu-touch/issues/28
https://github.com/ubports/ubuntu-touch/issues/649

No solution yet, though.