Confirmed to resolve the MAAS upgrade crash on an existing Trusty MAAS environment.
Beware however, after rev 2230 was confirmed in the repo, I was still stuck in a loop with apt/dpkg trying to install rev 2227. I couldn't complete an apt-get update (it halted, advising that dpkg --configure -a must first be run). But dpkg --configure -a tried to install rev 2227, bringing me back to the initial crash symptom.
This broke that cycle, and upgraded to 2230:
$ sudo dpkg --clear-selections
$ sudo apt-get update -y && sudo apt-get upgrade
Confirmed to resolve the MAAS upgrade crash on an existing Trusty MAAS environment.
Beware however, after rev 2230 was confirmed in the repo, I was still stuck in a loop with apt/dpkg trying to install rev 2227. I couldn't complete an apt-get update (it halted, advising that dpkg --configure -a must first be run). But dpkg --configure -a tried to install rev 2227, bringing me back to the initial crash symptom.
This broke that cycle, and upgraded to 2230:
$ sudo dpkg --clear-selections
$ sudo apt-get update -y && sudo apt-get upgrade
Thank you all!